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TI-2026-08489 Aliases CVE-2026-9678GHSA-pr7r-676h-xcf6

undici vulnerable to cross-user information disclosure via shared cache whitespace bypass

Priority LOW 27CWE-524Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 4 fixed, 12 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

Impact: Undici's cache interceptor incorrectly classifies some responses as cacheable when the upstream Cache-Control header uses whitespace-padded qualified private or no-cache field names such as private=" authorization" or no-cache="\tauthorization". The parser preserves the surrounding whitespace, so later comparisons against the literal authorization field name fail and the response is stored. In shared-cache mode, this allows a response containing one user's authenticated data to be served from cache to a subsequent caller, including an unauthenticated caller, when both requests resolve to the same cache key. Affected applications are those that explicitly enable the cache interceptor (interceptors.cache()) in shared mode, forward Authorization headers upstream, and receive cacheable responses with non-canonical qualified private or no-cache directives. Patches: Upgrade to undici v7.28.0 or v8.5.0. Workarounds: If upgrade is not immediately possible, disable shared-cache mode for traffic that includes Authorization headers, avoid caching responses to authenticated requests, or add Vary: Authorization upstream.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00388 33rd percentileScored 2026-11-07
Fix Partial undici (undici): 7.28.0, 8.5.0undici (npm): 7.28.0, 8.5.0Red Hat: 9 advisoriesRed Hat: 4 fixed, 12 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 7.28.0; 8.0.0 to before 8.5.07.28.0, 8.5.0Patch availableCNA
—undici (npm)7.0.0 to before 7.28.07.28.0Patch availableGHSA-pr7r-676h-xcf6
—undici (npm)8.0.0 to before 8.5.08.5.0Patch availableGHSA-pr7r-676h-xcf6
  • undici VendorNodeJS Affected 7.0.0 to before 7.28.0; 8.0.0 to before 8.5.0 Fixed in 7.28.0, 8.5.0 Patch available CNA
  • undici (npm) Vendor— Affected 7.0.0 to before 7.28.0 Fixed in 7.28.0 Patch available GHSA-pr7r-676h-xcf6
  • undici (npm) Vendor— Affected 8.0.0 to before 8.5.0 Fixed in 8.5.0 Patch available GHSA-pr7r-676h-xcf6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*7.0.0 to before 7.28.0; 8.0.0 to before 8.5.0VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 7.0.0 to before 7.28.0; 8.0.0 to before 8.5.0 Vulnerable ·NodeJS

Remediation

  • Fix · CNA undici (undici) Fixed in 7.28.0, 8.5.0
  • Fix · GHSA-pr7r-676h-xcf6 undici (npm) Fixed in 7.28.0 Advisory →
  • Fix · GHSA-pr7r-676h-xcf6 undici (npm) Fixed in 8.5.0 Advisory →

Red Hat 9 advisories

  • RHSA-2026:41947 Released 2026-07-20 · Red Hat rating Important
    nodejs:22 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) nodejs-1:22.23.1-1.module+el8.10.0+24500+8eb51621.aarch64::nodejs:22, nodejs-1:22.23.1-1.module+el8.10.0+24500+8eb51621.ppc64le::nodejs:22, nodejs-1:22.23.1-1.module+el8.10.0+24500+8eb51621.s390x::nodejs:22 +28
  • RHSA-2026:39868 Released 2026-07-15 · Red Hat rating Important
    nodejs:24 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) nodejs-1:24.18.0-1.module+el8.10.0+24481+7a71fac8.aarch64::nodejs:24, nodejs-1:24.18.0-1.module+el8.10.0+24481+7a71fac8.ppc64le::nodejs:24, nodejs-1:24.18.0-1.module+el8.10.0+24481+7a71fac8.s390x::nodejs:24 +25
  • RHSA-2026:38236 Released 2026-07-11 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images nodejs24-1:24.18.0-0.3.hum1@aarch64, nodejs24-1:24.18.0-0.3.hum1@src, nodejs24-1:24.18.0-0.3.hum1@x86_64 +16
Show 6 more Red Hat advisories
  • RHSA-2026:35892 Released 2026-07-06 · Red Hat rating Important
    nodejs:22 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) nodejs-1:22.23.1-1.module+el9.8.0+24457+996af7aa.aarch64::nodejs:22, nodejs-1:22.23.1-1.module+el9.8.0+24457+996af7aa.ppc64le::nodejs:22, nodejs-1:22.23.1-1.module+el9.8.0+24457+996af7aa.s390x::nodejs:22 +28
  • RHSA-2026:35891 Released 2026-07-06 · Red Hat rating Important
    nodejs:24 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) nodejs-1:24.18.0-1.module+el9.8.0+24456+b244c3b4.aarch64::nodejs:24, nodejs-1:24.18.0-1.module+el9.8.0+24456+b244c3b4.ppc64le::nodejs:24, nodejs-1:24.18.0-1.module+el9.8.0+24456+b244c3b4.s390x::nodejs:24 +25
  • RHSA-2026:35842 Released 2026-07-06 · Red Hat rating Important
    nodejs22 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) nodejs-1:22.23.1-2.el10_2, nodejs-devel-1:22.23.1-2.el10_2, nodejs-docs-1:22.23.1-2.el10_2 +4
  • RHSA-2026:35841 Released 2026-07-06 · Red Hat rating Important
    nodejs24 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) nodejs24-1:24.18.0-1.el10_2, nodejs24-devel-1:24.18.0-1.el10_2, nodejs24-docs-1:24.18.0-1.el10_2 +3
  • RHSA-2026:22380 Released 2026-06-02 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nodejs26-26.3.0-1.2.hum1@aarch64, nodejs26-26.3.0-1.2.hum1@src, nodejs26-26.3.0-1.2.hum1@x86_64 +14
  • RHSA-2026:7378 Released 2026-04-10 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nodejs25-25.9.0-1.1.hum1@aarch64, nodejs25-25.9.0-1.1.hum1@src, nodejs25-25.9.0-1.1.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 7.28.0, 8.5.0

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-08499 undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgentPriority LOW 35
    Show all 2 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Cryostat 4AffectedNo fix yet: Fix deferred
OpenShift PipelinesAffectedNo fix yet: Fix deferred
Red Hat AMQ Broker 7AffectedNo 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 8AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Red Hat OpenShift Dev SpacesAffectedNo fix yet: Fix deferred
Red Hat Openshift Data Foundation 4AffectedNo fix yet: Fix deferred
Self-service automation portal 2AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:35841, RHSA-2026:35842
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:39868, RHSA-2026:41947
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:35891, RHSA-2026:35892
Red Hat Hardened ImagesFixed RHSA-2026:22380, RHSA-2026:38236, RHSA-2026:7378
Not affected: 2 products
  • Red Hat Hardened Images
  • Red Hat OpenShift AI (RHOAI)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-9678
  2. 2026-10-03 Alias added: GHSA-pr7r-676h-xcf6
  3. 2026-10-27 Affected versions changed · Red Hat
  4. 2026-11-06 Affected versions changed · Red Hat

References

Advisory 3

Other 1

  • 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