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CVE-2026-87018

HIGH 7.5

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

undici is an HTTP client library for Node.js. In versions 4.2.1 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, the client process crashes when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does not match the requested host. Node.js re-runs hostname verification on the renegotiated handshake and destroys the socket with a certificate-altname error, but undici's established-socket error handler asserted that this error code could never occur, so the peer-controlled error became an uncaught assertion that terminates the Node.js process, affecting both the HTTP/1.1 and HTTP/2 paths. A malicious or compromised HTTPS endpoint reached through undici or the global fetch() can crash the client with a single server-initiated renegotiation, taking down all in-flight requests and background work in the process, and exploitation needs no CA compromise because the attacker controls the endpoint and can present two ordinary valid certificates. Only TLS 1.2 is affected, since TLS 1.3 does not support renegotiation. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. As a workaround, restrict outbound connections to TLS 1.3 so renegotiation cannot occur, when the target endpoints support it.

ELEVATED IMPACT

Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 8th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.5CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

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: No special conditions — reliably repeatable

✓ 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-248: : Uncaught Exception
  • CWE-617: : Reachable Assertion

CVSS vector

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

References and research data (JSON)

Vendor product assessments

Showing 32 of 226 vendor product statements; 194 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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs24-docs-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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs24-npm-bin-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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs26-0:26.11.1-0.5.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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs26-bin-1:26.12.1-0.1.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&epoch=1&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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs26-devel-1:26.12.1-0.1.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&epoch=1&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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs26-full-i18n-0:26.11.1-0.4.hum1@s390x as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=s390x&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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs26-libs-0:26.11.1-0.5.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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs26-npm-0:11.20.0-1.26.11.1.0.5.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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs26-npm-bin-1:26.12.1-0.1.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&epoch=1&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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • v8-14.6-devel-0:14.6.202.34-1.26.11.1.0.5.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-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs-full-i18n as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-full-i18n

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs24.src as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs24?arch=src

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs-libs (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

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

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs-packaging (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

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

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • v8-12.4-devel (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/v8-12.4-devel?rpmmod=nodejs:24

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • nodejs-libs (nodejs:26) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-libs?rpmmod=nodejs:26

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • ubi9/nodejs-24 as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:oci/nodejs-24@sha256:07b369ed90167eaa3249845359f52f565c3a7cab72d833b999976bcee395d069?repository_url=registry.redhat.io/ubi9/nodejs-24

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • rhoai/odh-mod-arch-gen-ai-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-gen-ai-rhel9@sha256:aa5a8ab4112bf9d6a356740103d97497f7b76071ab979eeb3d6a86322f928e31?repository_url=registry.redhat.io/rhoai/odh-mod-arch-gen-ai-rhel9

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • odf4/mcg-core-rhel9 as a component of Red Hat Openshift Data Foundation 4 · known affected

    Vendor assessment for this product only.

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

    • none available: Affected
    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • v8-14.6-devel-3:14.6.202.34-1.26.12.1.0.1.hum1@aarch64 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=aarch64&epoch=3&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • v8-14.6-devel-3:14.6.202.34-1.26.12.1.0.1.hum1@s390x 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=s390x&epoch=3&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-rpms

    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+00:00
  • v8-14.6-devel-3:14.6.202.34-1.26.12.1.0.1.hum1@x86_64 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=x86_64&epoch=3&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    Red Hat · CVE-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+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-2026-87018 · Updated 2026-10-22T05:32:54+00:00

Known Affected Software Configurations

VendorProductVersion range
NodejsUndici≥ 4.2.1 and < 6.29.1
NodejsUndici≥ 7.0.0 and < 7.30.1
NodejsUndici≥ 8.0.0 and < 8.12.2

All CVSS metrics

  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS