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TI-2026-74888 Aliases CVE-2026-109829GHSA-4w7w-5xrc-9h26

undici cache poisoning and cross-user disclosure via cross-origin redirects

Priority MEDIUM 40CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 4 fixed, 15 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-346.

Summary

undici from 7.0.0 before 7.30.1 and from 8.0.0 before 8.12.2 builds its cache key from the original request URL before a cross-origin redirect changes the origin. An attacker who controls a redirect target from a trusted URL can have their response cached under that trusted URL and served to later callers, and a private redirect response can be stored under the original URL and disclosed to an unauthenticated caller. Exploitation requires an originless Agent, a shared cache store, and the redirect-then-cache composition. The flaw is tracked as CWE-346.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

undici is an HTTP client library for Node.js. In versions 7.0.0 through 7.30.0 and 8.0.0 through 8.12.1, when an originless Agent composes the redirect and cache interceptors in that order with a shared cache store, the cache builds its key from the original request URL before the redirect handler changes the origin, so a response produced after a cross-origin redirect is stored under the original key. An attacker who controls the target of a redirect from a trusted URL can have their response cached under that trusted URL and served to later callers, allowing persistent cache poisoning, and the same key confusion lets a private, non-stored redirect response to a user-specific resource be stored under the original URL and served to a later unauthenticated caller, disclosing private data. Applications are affected only when an originless Agent, a shared cache store, and the redirect-then-cache composition are all used. The issue is fixed in undici 7.30.1 and 8.12.2, which verify the producing origin still matches the cache key and preserve each redirect hop's cache-control policy before storing, and users should upgrade to one of those versions or later. As a workaround, compose the cache interceptor before the redirect interceptor, use per-origin dispatchers and cache stores, or disable shared caching on redirect-capable requests.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00149 4th percentileScored 2026-11-07
Fix Partial undici (undici): 7.30.1, 8.12.2undici (npm): 7.30.1, 8.12.2Red Hat: 6 advisoriesRed Hat: 4 fixed, 15 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
NodeJSundici7.0.0 to before 7.30.1; 8.0.0 to before 8.12.27.30.1, 8.12.2Patch availableCNA
—undici (npm)7.0.0 to before 7.30.17.30.1Patch availableGHSA-4w7w-5xrc-9h26
—undici (npm)8.0.0 to before 8.12.28.12.2Patch availableGHSA-4w7w-5xrc-9h26
  • undici VendorNodeJS Affected 7.0.0 to before 7.30.1; 8.0.0 to before 8.12.2 Fixed in 7.30.1, 8.12.2 Patch available CNA
  • undici (npm) Vendor— Affected 7.0.0 to before 7.30.1 Fixed in 7.30.1 Patch available GHSA-4w7w-5xrc-9h26
  • undici (npm) Vendor— Affected 8.0.0 to before 8.12.2 Fixed in 8.12.2 Patch available GHSA-4w7w-5xrc-9h26

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*7.0.0 to before 7.30.1; 8.0.0 to before 8.12.2VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 7.0.0 to before 7.30.1; 8.0.0 to before 8.12.2 Vulnerable ·NodeJS

Remediation

Upgrade to undici 7.30.1 or 8.12.2 or later. Red Hat fixes are in RHSA-2026:95591, RHSA-2026:95124, RHSA-2026:95081, RHSA-2026:92510, RHSA-2026:84706 and RHSA-2026:84657, covering Cluster Observability Operator 1.5, Red Hat Trusted Artifact Signer 1.5, Red Hat OpenShift AI 3.4 and Red Hat Hardened Images. Red Hat plans no fix for Secrets Management Console for Red Hat OpenShift, and the sources list no fixed version for other affected Red Hat products, including Red Hat Enterprise Linux 8, 9 and 10. Until upgrading, compose the cache interceptor before the redirect interceptor, use per-origin dispatchers and cache stores, or disable shared caching on redirect-capable requests.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA undici (undici) Fixed in 7.30.1, 8.12.2
  • Fix · GHSA-4w7w-5xrc-9h26 undici (npm) Fixed in 7.30.1 Advisory →
  • Fix · GHSA-4w7w-5xrc-9h26 undici (npm) Fixed in 8.12.2 Advisory →

Red Hat 6 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-2026:95124 Released 2026-11-04 · Red Hat rating Important
    RHTAS 1.5.1 - Red Hat Trusted Artifact Signer Release
    • Red Hat Trusted Artifact Signer 1.5 registry.redhat.io/rhtas/rhtas-console-rhel9, registry.redhat.io/rhtas/rhtas-console-ui-rhel9
  • 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
Show 3 more Red Hat advisories
  • RHSA-2026:92510 Released 2026-10-29 · Red Hat rating Critical
    RHOAI 3.4.6 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-cli-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9 +47
  • RHSA-2026:84706 Released 2026-10-19 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images nodejs24-24.21.0-1.5.hum1@aarch64, nodejs24-24.21.0-1.5.hum1@s390x, nodejs24-24.21.0-1.5.hum1@src +25
  • RHSA-2026:84657 Released 2026-10-19 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images nodejs26-26.11.1-0.4.hum1@aarch64, nodejs26-26.11.1-0.4.hum1@s390x, nodejs26-26.11.1-0.4.hum1@src +25

Fixed in the same release

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

  • Release ·

    undici 7.30.1, 8.12.2

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-74993 Uncaught exception in undici decompress interceptor allows crashesPriority LOW 32
    • TI-2026-74889 Subresource Integrity bypass in undici fetch via mixed-case tokensPriority LOW 32
    Show all 3 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet
Red Hat AMQ Broker 7AffectedNo fix yet
Red Hat Build of Podman DesktopAffectedNo fix yet
Red Hat Developer Hub 1AffectedNo 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 Container Platform 4AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
Red Hat OpenShift Dev SpacesAffectedNo fix yet
Red Hat Openshift Data Foundation 4AffectedNo fix yet
Secrets Management Console for Red Hat OpenShiftAffectedNo fix planned: Will not fix
Self-service automation portal 2AffectedNo fix yet
Cluster Observability Operator 1.5Fixed RHSA-2026:95081, RHSA-2026:95591
Red Hat Hardened ImagesFixed RHSA-2026:84657, RHSA-2026:84706
Red Hat OpenShift AI 3.4Fixed RHSA-2026:92510
Red Hat Trusted Artifact Signer 1.5Fixed RHSA-2026:95124
Not affected: 11 products
  • Cluster Observability Operator 1.5
  • Cryostat 4
  • Red Hat AMQ Broker 7
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images
  • Red Hat OpenShift AI 3.4
  • Red Hat Openshift Data Foundation 4
  • Red Hat Trusted Artifact Signer 1.5

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-109829
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 Affected versions changed · Red Hat
  4. 2026-10-16 CVSS score added · Red Hat
  5. 2026-10-18 CISA SSVC decision points changed
  6. 2026-10-18 Affected versions changed · Red Hat
  7. 2026-10-19 Fix available: RHSA-2026:84657 · Red Hat
  8. 2026-10-19 Fix available: RHSA-2026:84706 · Red Hat
  9. 2026-10-20 CVSS score added · NVD
  10. 2026-10-20 Priority changed: LOW → MEDIUM
  11. 2026-10-20 Fix available: Red Hat Hardened Images · Red Hat
  12. 2026-10-22 Affected versions changed · Red Hat
  13. 2026-10-27 Affected versions changed · Red Hat
  14. 2026-10-27 Alias added: GHSA-4w7w-5xrc-9h26
  15. 2026-10-30 Fix available: RHSA-2026:92510 · Red Hat
  16. 2026-10-30 Fix available: Red Hat OpenShift AI 3.4 · Red Hat
  17. 2026-10-30 Affected versions changed · Red Hat
  18. 2026-11-02 Affected versions changed · Red Hat
  19. 2026-11-04 Fix available: RHSA-2026:95081 · Red Hat
  20. 2026-11-04 Fix available: RHSA-2026:95124 · Red Hat
  21. 2026-11-04 Fix available: Cluster Observability Operator 1.5, Red Hat Trusted Artifact Signer 1.5 · Red Hat
  22. 2026-11-06 Affected versions changed · Red Hat
  23. 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