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TI-2026-58374 Aliases CVE-2026-84933GHSA-2jfj-6hjv-fm6j

undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared caches

Priority LOW 35CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · Low · None
Fix status
Partial Red Hat: 1 fixed, 9 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-200.

Summary

undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header. In shared cache mode, which is the default, an otherwise cacheable response that carries a Set-Cookie header, for example one marked with a public and max-age directive, is stored and then re-served to a later caller that matches the same cache key. As a result one caller's cookie is disclosed to a different caller, and an untrusted server can inject cookies into cached responses served to all subsequent callers. This violates the requirement that a shared cache must not store cookies. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. 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 0.00303 23rd percentileScored 2026-11-07
Fix Partial undici (undici): 7.29.1, 8.10.2undici (npm): 7.29.1, 8.10.2Red Hat: 3 advisoriesRed Hat: 1 fixed, 9 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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 7.29.1; 8.0.0 to before 8.10.27.29.1, 8.10.2Patch availableCNA
—undici (npm)7.0.0 to before 7.29.17.29.1Patch availableGHSA-2jfj-6hjv-fm6j
—undici (npm)8.0.0 to before 8.10.28.10.2Patch availableGHSA-2jfj-6hjv-fm6j
  • undici VendorNodeJS Affected 7.0.0 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 7.0.0 to before 7.29.1 Fixed in 7.29.1 Patch available GHSA-2jfj-6hjv-fm6j
  • undici (npm) Vendor— Affected 8.0.0 to before 8.10.2 Fixed in 8.10.2 Patch available GHSA-2jfj-6hjv-fm6j

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*7.0.0 to before 7.29.1; 8.0.0 to before 8.10.2VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 7.0.0 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-2jfj-6hjv-fm6j undici (npm) Fixed in 7.29.1 Advisory →
  • Fix · GHSA-2jfj-6hjv-fm6j undici (npm) Fixed in 8.10.2 Advisory →

Red Hat 3 advisories

  • 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
  • RHSA-2026:54389 Released 2026-08-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images nodejs26-1:26.7.0-1.5.2.hum1@aarch64, nodejs26-1:26.7.0-1.5.2.hum1@src, nodejs26-1:26.7.0-1.5.2.hum1@x86_64 +16

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-2026-58384 undici vulnerable to TLS certificate validation bypass via dropped connect options in BalancedPoolPriority MEDIUM 40
    • 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: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
OpenShift PipelinesAffectedNo fix yet: Fix deferred
Red Hat Build of Podman DesktopAffectedNo fix yet: Fix deferred
Red Hat Developer Hub 1AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesAffectedNo fix planned: Will not fix
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Dev SpacesAffectedNo fix yet: Fix deferred
Red Hat Trusted Artifact SignerAffectedNo fix planned: Out of support scope
Red Hat Hardened ImagesFixed RHSA-2026:54389, RHSA-2026:54438, RHSA-2026:66008
Not affected: 12 products
  • Exploit Intelligence
  • 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 (RHOAI)
  • Red Hat OpenShift Container Platform 4
  • Red Hat Openshift Data Foundation 4
  • Secrets Management Console for Red Hat OpenShift
  • Self-service automation portal 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84933
  2. 2026-10-03 Alias added: GHSA-2jfj-6hjv-fm6j
  3. 2026-10-27 Affected versions changed · 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