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CVE-2026-109869

HIGH 7.5

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

undici is an HTTP client library for Node.js. In versions 6.23.0 through 6.29.0, 7.18.0 through 7.30.0, and 8.0.0 through 8.12.1, its fetch() implementation crashes the Node.js process when a malicious server returns a response with more than five content codings and closes the connection before sending the body. undici rejects such responses because of a content-encoding limit, but it created the internal response stream before that check and returned without attaching an error listener or aborting the request, so the early close surfaces a content-length mismatch on the orphaned stream, which Node.js treats as an unhandled error and terminates the process. A remote, unauthenticated server can trigger this with a single response, even when the application correctly catches the fetch() rejection, resulting in a denial of service. 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. There is no workaround.

ELEVATED IMPACT

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

Exploitation likelihood

0.3%chance of exploitation in 30 days · 28th 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

Search GitHub now — results may be empty or unverified.

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-459: : Incomplete Cleanup

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)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • undici npm

    pkg:npm/undici

    SEMVER range
    • Introduced version (included): 6.23.0
    • Fixed boundary (excluded): 6.29.1
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"
  }
}
    GitHub Advisory Database · GHSA-xjj6-f33q-929c · Updated 2026-10-23T22:30:05.007687918Z
  • undici npm

    pkg:npm/undici

    SEMVER range
    • Introduced version (included): 7.18.0
    • Fixed boundary (excluded): 7.30.1
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"
  }
}
    GitHub Advisory Database · GHSA-xjj6-f33q-929c · Updated 2026-10-23T22:30:05.007687918Z
  • undici npm

    pkg:npm/undici

    SEMVER range
    • Introduced version (included): 8.0.0
    • Fixed boundary (excluded): 8.12.2
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xjj6-f33q-929c/GHSA-xjj6-f33q-929c.json"
  }
}
    GitHub Advisory Database · GHSA-xjj6-f33q-929c · Updated 2026-10-23T22:30:05.007687918Z

Vendor product assessments

Showing 32 of 198 vendor product statements; 166 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-2026-109869 · Updated 2026-10-22T05:33:03+00:00
  • nodejs24-devel-0:24.21.0-1.5.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-2026-109869 · Updated 2026-10-22T05:33:03+00:00
  • nodejs24-libs-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-2026-109869 · Updated 2026-10-22T05:33:03+00:00
  • nodejs24-npm-bin-0:24.21.0-1.5.hum1@noarch@public-hummingbird-x86_64-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-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-2026-109869 · Updated 2026-10-22T05:33:03+00:00
  • nodejs26-1:26.12.1-0.1.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-2026-109869 · Updated 2026-10-22T05:33:03+00:00
  • nodejs26-devel-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-2026-109869 · Updated 2026-10-22T05:33:03+00:00
  • nodejs26-docs-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-2026-109869 · Updated 2026-10-22T05:33:03+00:00
  • nodejs26-full-i18n-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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+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-2026-109869 · Updated 2026-10-22T05:33:03+00:00

Known Affected Software Configurations

VendorProductVersion range
NodejsUndici≥ 6.23.0 and < 6.29.1
NodejsUndici≥ 7.18.0 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