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CVE-2026-109924

MEDIUM 5.9

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

undici is an HTTP client library for Node.js. In versions 6.5.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its EventSource client can be driven to exhaust process memory by a malicious or compromised Server-Sent Events peer. By sending millions of tiny completed data fields with no blank event separator, or a single unfinished line split across many chunks, the parser retains a growing amount of per-field and per-chunk state that the byte-based maxEventSize and maxResponseSize limits do not bound, and because maxResponseSize is enforced on the compressed body before decompression, a small compressed response can expand into enough retained memory to terminate the process. An application only needs to maintain an EventSource connection to an untrusted peer, which controls only the response, and availability is the only impact. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which bound the retained parser state independently of the byte limits, and users should upgrade to one of those versions or later. There is no workaround.

NO EXPLOITATION SIGNALS

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

Exploitation likelihood

0.3%chance of exploitation in 30 days · 25th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

5.9CVSS 3.1 · MEDIUM

  • 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: 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

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-770: : Allocation of Resources Without Limits or Throttling

CVSS vector

CVSS:3.1/AV:N/AC:H/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): 6.5.0
    • 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-4qv8-2p9j-2685/GHSA-4qv8-2p9j-2685.json"
  }
}
    GitHub Advisory Database · GHSA-4qv8-2p9j-2685 · Updated 2026-10-23T22:30:04.104974737Z
  • undici npm

    pkg:npm/undici

    SEMVER range
    • Introduced version (included): 7.0.0
    • 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-4qv8-2p9j-2685/GHSA-4qv8-2p9j-2685.json"
  }
}
    GitHub Advisory Database · GHSA-4qv8-2p9j-2685 · Updated 2026-10-23T22:30:04.104974737Z
  • 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-4qv8-2p9j-2685/GHSA-4qv8-2p9j-2685.json"
  }
}
    GitHub Advisory Database · GHSA-4qv8-2p9j-2685 · Updated 2026-10-23T22:30:04.104974737Z

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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs24-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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs24-docs-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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs24-libs-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-2026-109924 · Updated 2026-10-22T06:02:38+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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-1:26.12.1-0.1.hum1@src as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=src&epoch=1&distro=hummingbird-20251124&repository_id=public-hummingbird-source-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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-bin-1:26.12.1-0.1.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&epoch=1&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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-devel-1:26.12.1-0.1.hum1@s390x as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=s390x&epoch=1&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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-docs-1:26.12.1-0.1.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&epoch=1&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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-full-i18n-1:26.12.1-0.1.hum1@s390x as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=s390x&epoch=1&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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-libs-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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-npm-1:11.20.0-1.26.12.1.0.1.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&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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs26-npm-bin-1:26.12.1-0.1.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&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-2026-109924 · Updated 2026-10-22T06:02:38+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-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • cryostat/cryostat-openshift-console-plugin-rhel9 as a component of Cryostat 4 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • rhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator as a component of Red Hat Developer Hub · known affected

    Vendor assessment for this product only.

    pkg:oci/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator@sha256:924c4e5e8642438f3099272ff7edd746a66fcec4779aeafb9fd6b3ae0c594f72?repository_url=registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator

    • none available: Affected
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+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: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs24-npm as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs24-npm

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs-docs (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs-packaging-bundler (nodejs:22) 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:22

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • v8-13.6-devel (nodejs:22) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/v8-13.6-devel?rpmmod=nodejs:22

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • nodejs-libs (nodejs:24) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • npm (nodejs:24) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • rhoai/odh-mlflow-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mlflow-rhel9@sha256:26ac33d2d07f9d51df725604ca695c98597f9bf428f6038bb1d74f9405e8db2d?repository_url=registry.redhat.io/rhoai/odh-mlflow-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-workbench-codeserver-datascience-cpu-py312-rhel9@sha256:7b24ef41420bc79e19ff6349bb4760b2834bdc245eeb0b9191a8e77d90515a3a?repository_url=registry.redhat.io/rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+00:00
  • odf4/odf-console-rhel9 as a component of Red Hat Openshift Data Foundation 4 · known affected

    Vendor assessment for this product only.

    pkg:oci/odf-console-rhel9@sha256:828bd1ff329bcaf07bfa18df334190354753e0ccf75bebf4a441b152141c9168?repository_url=registry.redhat.io/odf4/odf-console-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+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: Fix deferred
    Red Hat · CVE-2026-109924 · Updated 2026-10-22T06:02:38+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-2026-109924 · Updated 2026-10-22T06:02:38+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-2026-109924 · Updated 2026-10-22T06:02:38+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-2026-109924 · Updated 2026-10-22T06:02:38+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-2026-109924 · Updated 2026-10-22T06:02:38+00:00

Known Affected Software Configurations

VendorProductVersion range
NodejsUndici≥ 6.5.0 and < 6.29.1
NodejsUndici≥ 7.0.0 and < 7.30.1
NodejsUndici≥ 8.0.0 and < 8.12.2

All CVSS metrics

  • MEDIUM 5.9 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • MEDIUM 5.9 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · NVD Primary
    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