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CVE-2026-109383

HIGH 7.4

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

undici is an HTTP client library for Node.js. In versions 4.0.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its Agent dispatcher passes its constructor options through a JSON-based deep clone before forwarding them to each per-origin pool, and because JSON cannot represent functions, a caller-supplied tls option containing a checkServerIdentity callback is silently dropped before it reaches the TLS layer. As a result, a TLS peer whose certificate a custom checkServerIdentity was written to reject, but which passes Node's default hostname and chain checks, is silently accepted. Because Agent is the default dispatcher behind request, fetch, and setGlobalDispatcher, this affects the path most applications use, and EnvHttpProxyAgent is affected on its direct and no-proxy routes as well, while only applications that pass a function-valued tls option such as a custom checkServerIdentity for certificate or public-key pinning are at risk. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which preserve the tls option outside the JSON clone so custom verification callbacks are forwarded unchanged, and users should upgrade to one of those versions or later. As a workaround, pass the TLS options through connect instead of tls, or for proxied destinations use requestTls and proxyTls.

ELEVATED IMPACT

Severe if exploited (CVSS 7.4), 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

7.4CVSS 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-295: : Improper Certificate Validation

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 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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • nodejs-libs as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-libs

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • ubi10/nodejs-24 as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:oci/nodejs-24@sha256:b6f5b60cc5484b22ea62f60df04f8f7977b7d3bfce933561308d8ba073864f51?repository_url=registry.redhat.io/ubi10/nodejs-24

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • nodejs-nodemon (nodejs:22) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-nodemon?rpmmod=nodejs:22

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • npm (nodejs:22) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/npm?rpmmod=nodejs:22

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • nodejs-docs (nodejs:26) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • nodejs (nodejs:26) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • rhoai/odh-mod-arch-automl-rhel9 as a component of Red Hat OpenShift AI (RHOAI) · known affected

    Vendor assessment for this product only.

    pkg:oci/odh-mod-arch-automl-rhel9@sha256:5cfd714e9a5fa61ed867771fbbb2b22e5a79ad05fd6940fa80dab09dfa43aef6?repository_url=registry.redhat.io/rhoai/odh-mod-arch-automl-rhel9

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • wasmedge-rt as a component of Red Hat OpenShift Container Platform 4 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/wasmedge-rt

    • none available: Affected
    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+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-2026-109383 · Updated 2026-10-22T05:33:00+00:00
  • odf4/mcg-core-rhel9 as a component of Red Hat Openshift Data Foundation 4 · under investigation

    Vendor assessment for this product only.

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

    Red Hat · CVE-2026-109383 · Updated 2026-10-22T05:33:00+00:00

Known Affected Software Configurations

VendorProductVersion range
NodejsUndici≥ 4.0.0 and < 6.29.1
NodejsUndici≥ 7.0.0 and < 7.30.1
NodejsUndici≥ 8.0.0 and < 8.12.2

All CVSS metrics

  • HIGH 7.4 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