CVE-2026-14643

Description

undici's cache interceptor mishandles optional whitespace placed around the equals sign of a qualified no-cache or private Cache-Control directive. In undici from 7.0.0 up to before 7.29.0 and from 8.0.0 up to before 8.9.0, the parser either drops the directive or stores a field name with literal quote characters, so the cache decision fails to recognize the qualification and the response is stored. In shared-cache mode, this lets a response containing one user's authenticated data be served from cache to a later caller, including an unauthenticated one, when both requests resolve to the same cache key. It affects applications that enable the cache interceptor in shared mode, forward Authorization headers upstream, and receive cacheable responses with qualified directives padded with whitespace around the equals sign. This is the whitespace-around-equals variant that the fix for CVE-2026-9678 did not normalize, and it is fixed in undici 7.29.0 and 8.9.0.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Trends

Current EPSS score: 0.30%• Percentile: 23%

Techniques & Countermeasures

• CWE-436•Interpretation Conflict

  Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.

• CWE-524•Use of Cache Containing Sensitive Information

  The code uses a cache that contains sensitive information, but the cache can be read by an actor outside of the intended control sphere.

Affected Systems

• chainguard•code-server

  < 4.130.0-r5

• chainguard•commercial-gitlab-rails-ee-19.1

  all

• chainguard•commercial-gitlab-rails-ee-19.2

  all

• chainguard•commercial-gitlab-rails-ee-19.3

  all

• chainguard•commercial-gitlab-rails-ee-fips-19.1

  all

• chainguard•commercial-gitlab-rails-ee-fips-19.2

  all

• chainguard•commercial-gitlab-rails-ee-fips-19.3

  all

• chainguard•kibana-9.1

  all

• chainguard•kibana-9.1-iamguarded

  all

• chainguard•kibana-9.2

  < 9.2.8-r19

• chainguard•kibana-9.2-iamguarded

  < 9.2.8-r19

• chainguard•kibana-9.3

  all

• chainguard•kibana-9.3-iamguarded

  all

• chainguard•langfuse-3

  < 3.225.0-r3

• chainguard•langfuse-3-compat

  < 3.225.7-r6

• chainguard•langfuse-3-worker

  < 3.225.0-r3

• chainguard•langfuse-4

  < 4.3.1-r3

• chainguard•langfuse-4-worker

  < 4.3.1-r3

• chainguard•langfuse-fips-3

  < 3.224.3-r9

• chainguard•langfuse-fips-3-worker

  < 3.224.3-r9

• chainguard•langfuse-fips-4

  < 4.4.0-r0

• chainguard•langfuse-fips-4-worker

  < 4.4.0-r0

• chainguard•pelias-api

  < 7.8.0-r7

• chainguard•renovate

  < 44.11.4-r0 | < 44.11.3-r0

• chainguard•vitess-24

  < 24.0.2-r10

• chainguard•vitess-24-compat

  < 24.0.3-r7

• wolfi•code-server

  < 4.130.0-r5

• wolfi•langfuse-3

  < 3.225.0-r3

• wolfi•langfuse-3-compat

  < 3.225.7-r6

• wolfi•langfuse-3-worker

  < 3.225.0-r3

• wolfi•renovate

  < 44.11.4-r0 | < 44.11.3-r0

• wolfi•vitess-24

  < 24.0.2-r10

• wolfi•vitess-24-compat

  < 24.0.3-r7

• debian•node-undici

  all | all | < 8.9.0+dfsg+~cs3.2.0-1

• ubuntu•node-undici

  all | all

• nodejs•undici

  ≥ 7.0.0, < 7.29.0 | ≥ 8.0.0, < 8.9.0

• Npm•undici

  ≥ 7.0.0, < 7.29.0 | ≥ 8.0.0, < 8.9.0

• undici•undici

  ≥ 7.0.0, < 7.29.0 | ≥ 8.0.0, < 8.9.0

References (12)

• https://github.com/nodejs/undici/security/advisories/GHSA-jr45-8vmc-qm54
• https://cna.openjsf.org/security-advisories.html
• https://ubuntu.com/security/CVE-2026-14643
• https://www.cve.org/CVERecord?id=CVE-2026-14643
• https://security-tracker.debian.org/tracker/CVE-2026-14643
• https://nvd.nist.gov/vuln/detail/CVE-2026-14643
• https://github.com/nodejs/undici/commit/85a240551c9feb8b8a0ecc56c84b2b3015add8a9
• https://github.com/nodejs/undici/commit/cb105d7c79069150982fa11acada0dd94a60dbbc
• https://github.com/nodejs/undici
• https://github.com/nodejs/undici/releases/tag/v7.29.0
• https://github.com/nodejs/undici/releases/tag/v8.9.0
• https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14643.json