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

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-84933 · CVE overview and exploitation status

EUVD-2026-71518

GHSA-2jfj-6hjv-fm6j

cve-program · CVE-2026-84933

• https://github.com/nodejs/undici/security/advisories/GHSA-2jfj-6hjv-fm6j
• https://cna.openjsf.org/security-advisories.html

euvd · EUVD-2026-71518

• https://github.com/nodejs/undici/security/advisories/GHSA-2jfj-6hjv-fm6j
• https://cna.openjsf.org/security-advisories.html

nvd · CVE-2026-84933

• https://cna.openjsf.org/security-advisories.html
• https://github.com/nodejs/undici/security/advisories/GHSA-2jfj-6hjv-fm6j

osv · GHSA-2jfj-6hjv-fm6j

• https://github.com/nodejs/undici/security/advisories/GHSA-2jfj-6hjv-fm6j
• https://nvd.nist.gov/vuln/detail/CVE-2026-84933
• https://github.com/nodejs/undici/commit/b6c5a00252c37da9dd2db9bead053bb843e1f988
• https://github.com/nodejs/undici/commit/cb75bbb34224a968b4ad80cab8b7aba5e0b3b28a
• https://cna.openjsf.org/security-advisories.html
• https://github.com/nodejs/undici
• https://github.com/nodejs/undici/releases/tag/v7.29.1
• https://github.com/nodejs/undici/releases/tag/v8.10.2

• 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 ca… · Advisory content revised · 5 Nov 2026