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CVE-2026-50252

MEDIUM 5.7 ALL-YEARS

Published 2026-07-22 · Last modified 2026-07-22 · NLnet Labs · NVD: Analyzed

In NLnet Labs Unbound 1.4.22 up to and including 1.25.1, UDP source port is randomized and intended to serve as a secret value that increases the entropy of DNS transactions. When resolver load balancing policies depend on the source port while their outcome is revealed this secrecy is undermined. The vulnerability arises when the load balancing policy is consistent with respect to the incoming source UDP port and IP address while heavily depending on the incoming source UDP port as a randomization source. When the SO_REUSEPORT configuration option is enabled ('so-reuseport: yes') in Unbound (by default), it meets these conditions, making it vulnerable for DNS cache poisoning attacks. Upon startup, Unbound randomly partitions the available UDP source port space into disjoint subsets of (almost) equal size, assigning each subset to a specific worker thread. When an incoming DNS query is received, the kernel’s SO_REUSEPORT load balancing mechanism deterministically assigns the query to a socket associated with a particular thread. All outgoing DNS queries generated during the resolution of that request use source ports selected exclusively from the port subset assigned to the corresponding thread. Since these port subsets are disjoint across threads, the source port observed in a resolver’s outgoing query to an authoritative name server serves as a reliable indicator of the worker thread that processed the original client query. A malicious actor can acquire the mapping between

LIMITED SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 7th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable no

Impact if exploited

5.7CVSS 4.0 · MEDIUM · CNA

  • ConfidentialityNone
  • IntegrityHigh
  • AvailabilityNone

What an attacker needs

  • ⚠Access: Must sit on the same / adjacent network
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Nlnet Labs Nlnetlabs

Products Unbound

Weakness (CWE)

  • CWE-349: : Acceptance of Extraneous Untrusted Data With Trusted Data

CVSS vector

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber

References and research data (JSON)

Vendor product assessments

Showing 32 of 195 vendor product statements; 163 omitted. Read the full vendor advisory.

  • python3-unbound-0:1.24.2-7.el10_2.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=aarch64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-0:1.24.2-7.el10_2.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-dracut-0:1.24.2-7.el10_2.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=aarch64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-libs-debuginfo-0:1.24.2-7.el10_2.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=ppc64le

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-utils-debuginfo-0:1.24.2-7.el10_2.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • python3-unbound-debuginfo-0:1.16.2-5.14.el8_10.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_10.2?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-debuginfo-0:1.16.2-5.14.el8_10.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_10.2?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-devel-0:1.16.2-5.14.el8_10.2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_10.2?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-libs-debuginfo-0:1.16.2-5.14.el8_10.2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_10.2?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • python3-unbound-debuginfo-0:1.24.2-3.el9_8.6.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_8.6?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-debuginfo-0:1.24.2-3.el9_8.6.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_8.6?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-dracut-0:1.24.2-3.el9_8.6.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_8.6?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-libs-debuginfo-0:1.24.2-3.el9_8.6.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_8.6?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-debuginfo-0:1.24.2-7.el10_2.5.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=aarch64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-devel-0:1.24.2-7.el10_2.5.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-utils-debuginfo-0:1.24.2-7.el10_2.5.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2.5?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-debuginfo-0:1.24.2-3.el9_8.6.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_8.6?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-devel-0:1.24.2-3.el9_8.6.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_8.6?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-main@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/unbound

    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    • none available: Affected
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-devel as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/unbound-devel

    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    • none available: Affected
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-libs as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/unbound-libs

    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    • none available: Affected
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-python as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/unbound-python

    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    • none available: Affected
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound.src as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/unbound?arch=src

    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    • none available: Affected
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4 · known affected

    Vendor assessment for this product only.

    pkg:oci/ose-rhel-coreos-8?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-8

    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    • none available: Affected
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · known affected

    Vendor assessment for this product only.

    pkg:oci/ose-rhel-coreos-9?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-9

    • workaround: Disable the so-reuseport option by explicitly setting so-reuseport: no in your unbound.conf file. This prevents the deterministic mapping of worker threads to outbound UDP source ports, effectively stopping the cache poisoning vector. Additionally, restrict who can query the resolver using the access-control directive to reduce the overall attack surface, and restart the Unbound service to apply the changes.
    • none available: Affected
    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/unbound

    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-devel as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/unbound-devel

    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-libs as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/unbound-libs

    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound-python as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/unbound-python

    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00
  • unbound.src as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/unbound?arch=src

    Red Hat · CVE-2026-50252 · Updated 2026-09-21T06:15:34+00:00

Known Affected Software Configurations

VendorProductVersion range
NlnetlabsUnbound≥ 1.4.22 and < 1.25.2

All CVSS metrics

  • MEDIUM 5.7 v4.0 · CNA Primary
    CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber
  • MEDIUM 5.7 v4.0 · NVD Secondary
    CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
  • CRITICAL 9.3 v3.1 · NVD Primary
    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS