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CVE-2026-109829

HIGH 7.4

Published 2026-10-15 · Last modified 2026-10-16

undici is an HTTP client library for Node.js. In versions 7.0.0 through 7.30.0 and 8.0.0 through 8.12.1, when an originless Agent composes the redirect and cache interceptors in that order with a shared cache store, the cache builds its key from the original request URL before the redirect handler changes the origin, so a response produced after a cross-origin redirect is stored under the original key. An attacker who controls the target of a redirect from a trusted URL can have their response cached under that trusted URL and served to later callers, allowing persistent cache poisoning, and the same key confusion lets a private, non-stored redirect response to a user-specific resource be stored under the original URL and served to a later unauthenticated caller, disclosing private data. Applications are affected only when an originless Agent, a shared cache store, and the redirect-then-cache composition are all used. The issue is fixed in undici 7.30.1 and 8.12.2, which verify the producing origin still matches the cache key and preserve each redirect hop's cache-control policy before storing, and users should upgrade to one of those versions or later. As a workaround, compose the cache interceptor before the redirect interceptor, use per-origin dispatchers and cache stores, or disable shared caching on redirect-capable requests.

ELEVATED IMPACT

Severe if exploited (CVSS 7.4), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.1%chance of exploitation in 30 days · 4th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.4CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup

✓ 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 daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Undici Nodejs

Products Undici

Weakness (CWE)

  • CWE-346: : Origin Validation Error
  • CWE-524: : Use of Cache Containing Sensitive Information

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References and research data (JSON)

Vendor product assessments

Showing 32 of 170 vendor product statements; 138 omitted. Read the full vendor advisory.

  • nodejs24-0:24.21.0-1.5.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs24-bin-0:24.21.0-1.5.hum1@noarch@public-hummingbird-s390x-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs24-docs-0:24.21.0-1.5.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs24-full-i18n-0:24.21.0-1.5.hum1@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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs24-npm-0:11.19.0-1.24.21.0.1.5.hum1@noarch@public-hummingbird-s390x-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs26-0:26.11.1-0.4.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs26-bin-0:26.11.1-0.4.hum1@noarch@public-hummingbird-s390x-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs26-docs-0:26.11.1-0.4.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs26-full-i18n-0:26.11.1-0.4.hum1@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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs26-npm-0:11.20.0-1.26.11.1.0.4.hum1@noarch@public-hummingbird-s390x-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • v8-13.6-devel-0:13.6.233.17-1.24.21.0.1.5.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • v8-14.6-devel-0:14.6.202.34-1.26.11.1.0.4.hum1@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
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • exploit-intelligence/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · known affected

    Vendor assessment for this product only.

    pkg:oci/vulnerability-analysis-rhel9@sha256:64fb01357ccdad3fde5b4448664a57967117e94418a26c6d8022fb4a7f31a4de?repository_url=registry.redhat.io/exploit-intelligence/vulnerability-analysis-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs-docs as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-docs

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs24-libs as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs24-libs

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs-full-i18n (nodejs:22) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-full-i18n?rpmmod=nodejs:22

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs-packaging-bundler (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-packaging-bundler?rpmmod=nodejs:24

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • npm (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/npm?rpmmod=nodejs:24

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs-docs (nodejs:24) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-docs?rpmmod=nodejs:24

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs.src (nodejs:26) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs?arch=src&rpmmod=nodejs:26

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • nodejs25.src as a component of Red Hat Hardened Images · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=src

    • no fix planned: Will not fix
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • rhoai/odh-mod-arch-maas-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-maas-rhel9@sha256:f46aa6658c532ac9e8fcb3feeb5d764d9ee0eaf9e8af0563e87ef3998b5e426e?repository_url=registry.redhat.io/rhoai/odh-mod-arch-maas-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • odf4/ocs-client-console-rhel9 as a component of Red Hat Openshift Data Foundation 4 · known affected

    Vendor assessment for this product only.

    pkg:oci/ocs-client-console-rhel9@sha256:7216ce2d92ad684f986c32dced35244e963be67154053b1969a05c93fbd9e966?repository_url=registry.redhat.io/odf4/ocs-client-console-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • ansible-automation-platform/bootc-automation-portal-rhel9 as a component of Self-service automation portal 2 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-automation-portal-rhel9@sha256:8553c734145775879bdfe2befa9f2df1c22c6d7db2f2251401c3cc517a7e0394?repository_url=registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • cryostat/cryostat-openshift-console-plugin-rhel9 as a component of Cryostat 4 · known not affected

    Vendor assessment for this product only.

    Reason: component not present

    pkg:oci/cryostat-openshift-console-plugin-rhel9@sha256:27ce23fe3bf779a813b98fe9fea4fae32c888eb497ebe0c0016c34f14f315512?repository_url=registry.redhat.io/cryostat/cryostat-openshift-console-plugin-rhel9

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • amq-broker-bin.zip as a component of Red Hat AMQ Broker 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:generic/[email protected]

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • automation-platform-ui.src as a component of Red Hat Ansible Automation Platform 2 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • grafana as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/grafana

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • grafana-selinux as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/grafana-selinux

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • grafana.src as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/grafana?arch=src

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • grafana12.4.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00
  • odf4/mcg-core-rhel9 as a component of Red Hat Openshift Data Foundation 4 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/mcg-core-rhel9@sha256:a2819b6d8b236267e913eadd39b6d9dee93c666d37796f78b00a8d88e81ee311?repository_url=registry.redhat.io/odf4/mcg-core-rhel9

    Red Hat · CVE-2026-109829 · Updated 2026-10-21T20:54:00+00:00

Known Affected Software Configurations

VendorProductVersion range
NodejsUndici≥ 7.0.0 and < 7.30.1
NodejsUndici≥ 8.0.0 and < 8.12.2

All CVSS metrics

  • HIGH 7.4 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  • HIGH 7.4 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  • CRITICAL 9.1 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS