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TI-2026-58384 Aliases CVE-2026-84961GHSA-w293-vg96-wgc3

undici vulnerable to TLS certificate validation bypass via dropped connect options in BalancedPool

Priority MEDIUM 40CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 14 fixed, 10 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-295.

Summary

undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and reparses the value as JSON. Because JSON cannot represent functions, any function-valued TLS option, such as a caller-supplied checkServerIdentity callback or a custom connector inside the connect option, is silently discarded before it reaches the TLS layer. As a result a peer whose certificate the application's custom checkServerIdentity was written to reject, but which still passes Node's default hostname and chain checks, is accepted when reached through BalancedPool. The Client, Pool, and Agent dispatchers are not affected because they extract the connect and tls options before cloning. This affects undici versions from 7.24.1 up to 7.29.1 and from 8.0.0 up to 8.10.2, and only when the application supplies a function-valued connect or tls option to BalancedPool. Users should upgrade to undici 7.29.1 or 8.10.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00178 7th percentileScored 2026-11-07
Fix Partial undici (undici): 7.29.1, 8.10.2undici (npm): 7.29.1, 8.10.2Red Hat: 20 advisoriesRed Hat: 14 fixed, 10 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NodeJSundici7.24.1 to before 7.29.1; 8.0.0 to before 8.10.27.29.1, 8.10.2Patch availableCNA
—undici (npm)7.24.1 to before 7.29.17.29.1Patch availableGHSA-w293-vg96-wgc3
—undici (npm)8.0.0 to before 8.10.28.10.2Patch availableGHSA-w293-vg96-wgc3
  • undici VendorNodeJS Affected 7.24.1 to before 7.29.1; 8.0.0 to before 8.10.2 Fixed in 7.29.1, 8.10.2 Patch available CNA
  • undici (npm) Vendor— Affected 7.24.1 to before 7.29.1 Fixed in 7.29.1 Patch available GHSA-w293-vg96-wgc3
  • undici (npm) Vendor— Affected 8.0.0 to before 8.10.2 Fixed in 8.10.2 Patch available GHSA-w293-vg96-wgc3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*7.24.1 to before 7.29.1; 8.0.0 to before 8.10.2VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 7.24.1 to before 7.29.1; 8.0.0 to before 8.10.2 Vulnerable ·NodeJS

Remediation

  • Fix · CNA undici (undici) Fixed in 7.29.1, 8.10.2
  • Fix · GHSA-w293-vg96-wgc3 undici (npm) Fixed in 7.29.1 Advisory →
  • Fix · GHSA-w293-vg96-wgc3 undici (npm) Fixed in 8.10.2 Advisory →

Red Hat 20 advisories

  • RHSA-2026:95591 Released 2026-11-05 · Red Hat rating Important
    Cluster Observability Operator - 1.5
    • Cluster Observability Operator 1.5 registry.redhat.io/cluster-observability-operator/alertmanager-rhel9, registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator, registry.redhat.io/cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9 +16
  • RHSA-2026:95081 Released 2026-11-04 · Red Hat rating Important
    Cluster Observability Operator - 1.5
    • Cluster Observability Operator 1.5 registry.redhat.io/cluster-observability-operator/alertmanager-rhel9, registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator, registry.redhat.io/cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9 +16
  • RHSA-2026:92650 Released 2026-10-29 · Red Hat rating Important
    Red Hat OpenShift Data Foundation 4.19.26 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.19 registry.redhat.io/odf4/cephcsi-rhel9, registry.redhat.io/odf4/cephcsi-rhel9-operator, registry.redhat.io/odf4/mcg-core-rhel9 +17
Show 17 more Red Hat advisories
  • RHSA-2026:90321 Released 2026-10-26 · Red Hat rating Critical
    Red Hat OpenShift Dev Spaces 3.31.0 Release.
    • Red Hat OpenShift Dev Spaces 3.31 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/jetbrains-ide-rhel9 +8
  • RHSA-2026:87410 Released 2026-10-21 · Red Hat rating Critical
    RHOAI 2.25.12 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 2.25 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-caikit-nlp-rhel9, registry.redhat.io/rhoai/odh-codeflare-operator-rhel9 +47
  • RHSA-2026:86891 Released 2026-10-21 · Red Hat rating Critical
    RHOAI 3.5.2 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.5 registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-cli-rhel9 +47
  • RHSA-2026:84734 Released 2026-10-19 · Red Hat rating Critical
    RHOAI 3.4.5 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-ai-gateway-payload-processing-rhel9, registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-autorag-rhel9 +47
  • RHSA-2026:82151 Released 2026-10-13 · Red Hat rating Critical
    Ansible automation portal Red Hat Enterprise Linux Images
    • Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9
  • RHSA-2026:80644 Released 2026-10-12 · Red Hat rating Critical
    Ansible plug-ins for Red Hat Developer Hub Product Release Update
    • Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/automation-portal
  • RHSA-2026:80603 Released 2026-10-12 · Red Hat rating Critical
    Ansible plug-ins for Red Hat Developer Hub Product Release Update
    • Red Hat Ansible Automation Platform 2.1 registry.redhat.io/ansible-automation-platform/automation-portal
  • RHSA-2026:79088 Released 2026-10-08 · Red Hat rating Critical
    Red Hat Developer Hub 1.10.5 release.
    • Red Hat Developer Hub 1.10 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
  • RHSA-2026:76788 Released 2026-10-06 · Red Hat rating Critical
    Red Hat Developer Hub 1.10.5 Plugin Catalog GA plugins release.
    • Red Hat Developer Hub 1.10 registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed, registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend, registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator +4
  • RHSA-2026:74609 Released 2026-10-01 · Red Hat rating Important
    Cluster Observability Operator 1.5.3
    • Cluster Observability Operator 1.5 registry.redhat.io/cluster-observability-operator/alertmanager-rhel9, registry.redhat.io/cluster-observability-operator/cluster-observability-rhel9-operator, registry.redhat.io/cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9 +13
  • RHSA-2026:74085 Released 2026-09-30 · Red Hat rating Important
    nodejs:24 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) nodejs-1:24.21.0-1.module+el8.10.0+24927+ed3d907a.aarch64::nodejs:24, nodejs-1:24.21.0-1.module+el8.10.0+24927+ed3d907a.ppc64le::nodejs:24, nodejs-1:24.21.0-1.module+el8.10.0+24927+ed3d907a.s390x::nodejs:24 +25
  • RHSA-2026:73838 Released 2026-09-30 · Red Hat rating Important
    nodejs:24 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) nodejs-1:24.21.0-1.module+el9.8.0+24924+cd677006.aarch64::nodejs:24, nodejs-1:24.21.0-1.module+el9.8.0+24924+cd677006.ppc64le::nodejs:24, nodejs-1:24.21.0-1.module+el9.8.0+24924+cd677006.s390x::nodejs:24 +25
  • RHSA-2026:73428 Released 2026-09-29 · Red Hat rating Important
    nodejs24 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) nodejs24-1:24.21.0-1.el10_2, nodejs24-devel-1:24.21.0-1.el10_2, nodejs24-docs-1:24.21.0-1.el10_2 +3
  • RHSA-2026:69248 Released 2026-09-21 · Red Hat rating Important
    Red Hat Developer Hub 1.9.9 release.
    • Red Hat Developer Hub 1.9 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
  • RHSA-2026:66605 Released 2026-09-11 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nodejs26-1:26.8.2-0.1.hum1@aarch64, nodejs26-1:26.8.2-0.1.hum1@src, nodejs26-1:26.8.2-0.1.hum1@x86_64 +14
  • RHSA-2026:66008 Released 2026-09-09 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images grafana12.4-12.4.10-0.2.hum1@aarch64, grafana12.4-12.4.10-0.2.hum1@src, grafana12.4-12.4.10-0.2.hum1@x86_64
  • RHSA-2026:54438 Released 2026-08-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nodejs24-1:24.18.1-0.2.2.hum1@aarch64, nodejs24-1:24.18.1-0.2.2.hum1@src, nodejs24-1:24.18.1-0.2.2.hum1@x86_64 +14

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    undici 7.29.1, 8.10.2

    7 records Highest priority Priority MEDIUM 1 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2026-58374 undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared cachesPriority LOW 35
    • TI-2026-58409 undici vulnerable to Denial of Service via WebSocketStream unclean closePriority LOW 33
    • TI-2026-58354 undici vulnerable to Denial of Service via unbounded decompression of compressed responsesPriority LOW 27
    Show all 7 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet
OpenShift PipelinesAffectedNo fix yet
Red Hat Build of Podman DesktopAffectedNo fix yet
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Hardened ImagesAffectedNo fix planned: Will not fix
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Red Hat Openshift Data Foundation 4AffectedNo fix yet
Secrets Management Console for Red Hat OpenShiftAffectedNo fix planned: Will not fix
Cluster Observability Operator 1.5Fixed RHSA-2026:74609, RHSA-2026:95081, RHSA-2026:95591
Red Hat Ansible Automation Platform 2.1Fixed RHSA-2026:80603
Red Hat Ansible Automation Platform 2.2Fixed RHSA-2026:80644, RHSA-2026:82151
Red Hat Developer Hub 1.10Fixed RHSA-2026:76788, RHSA-2026:79088
Red Hat Developer Hub 1.9Fixed RHSA-2026:69248
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:73428
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:74085
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:73838
Red Hat Hardened ImagesFixed RHSA-2026:54438, RHSA-2026:66008, RHSA-2026:66605
Red Hat OpenShift AI 2.25Fixed RHSA-2026:87410
Red Hat OpenShift AI 3.4Fixed RHSA-2026:84734
Red Hat OpenShift AI 3.5Fixed RHSA-2026:86891
Red Hat OpenShift Dev Spaces 3.31Fixed RHSA-2026:90321
Red Hat Openshift Data Foundation 4.19Fixed RHSA-2026:92650
Not affected: 15 products
  • Cluster Observability Operator 1.5
  • Red Hat AMQ Broker 7
  • Red Hat Ansible Automation Platform 2
  • Red Hat Developer Hub 1.10
  • Red Hat Developer Hub 1.9
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images
  • Red Hat OpenShift AI 2.25
  • Red Hat OpenShift AI 3.4
  • Red Hat OpenShift AI 3.5
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Dev Spaces 3.31
  • Red Hat Openshift Data Foundation 4.19
  • Red Hat Trusted Artifact Signer

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84961
  2. 2026-10-03 Alias added: GHSA-w293-vg96-wgc3
  3. 2026-10-07 Fix available: RHSA-2026:76788 · Red Hat
  4. 2026-10-07 Fix available: Red Hat Developer Hub 1.10 · Red Hat
  5. 2026-10-08 Affected versions changed · Red Hat
  6. 2026-10-09 Fix available: RHSA-2026:79088 · Red Hat
  7. 2026-10-09 Affected versions changed · Red Hat
  8. 2026-10-13 Fix available: RHSA-2026:80603 · Red Hat
  9. 2026-10-13 Fix available: RHSA-2026:80644 · Red Hat
  10. 2026-10-13 Fix available: Red Hat Ansible Automation Platform 2.1, Red Hat Ansible Automation Platform 2.2 · Red Hat
  11. 2026-10-13 Fix available: RHSA-2026:82151 · Red Hat
  12. 2026-10-20 Fix available: RHSA-2026:84734 · Red Hat
  13. 2026-10-20 Fix available: Red Hat OpenShift AI 3.4 · Red Hat
  14. 2026-10-22 Fix available: RHSA-2026:86891 · Red Hat
  15. 2026-10-22 Fix available: RHSA-2026:87410 · Red Hat
  16. 2026-10-23 Fix available: Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.5 · Red Hat
  17. 2026-10-29 Fix available: Red Hat OpenShift Dev Spaces 3.31 · Red Hat
  18. 2026-10-30 Fix available: RHSA-2026:90321 · Red Hat
  19. 2026-10-30 Fix available: Red Hat Openshift Data Foundation 4.19 · Red Hat
  20. 2026-10-31 Fix available: RHSA-2026:92650 · Red Hat
  21. 2026-11-04 Fix available: RHSA-2026:95081 · Red Hat
  22. 2026-11-04 Fix available: Cluster Observability Operator 1.5 · Red Hat
  23. 2026-11-06 Affected versions changed · Red Hat
  24. 2026-11-06 Fix available: RHSA-2026:95591 · Red Hat

References

Advisory 3

Other 5

  • TI-2026-01215 undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') CVSS 3.1CRITICAL 9.8
  • TI-2022-16376 `undici.request` vulnerable to SSRF using absolute URL on `pathname` CVSS 3.1CRITICAL 9.8
  • TI-2023-09734 CRLF Injection in Nodejs ‘undici’ via host CVSS 3.1MEDIUM 6.5
  • TI-2022-13193 CRLF injection in request headers CVSS 3.1MEDIUM 6.5
  • TI-2022-16375 CRLF Injection in Nodejs ‘undici’ via Content-Type CVSS 3.1MEDIUM 5.3
  • TI-2022-13194 Uncleared cookies on cross-host/cross-origin redirect in undici CVSS 3.1MEDIUM 6.5
See all 51 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences