[ CVE-2026-122131 · Published 4 Nov 2026 ]
Vulnerability in hapijs joi
CVSS 3.7
No fix listed yet
[ Description ]Official description
Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 contains a prototype pollution vulnerability in lib/messages.js compile() and merge() that fails to reject a __proto__ language key. Attackers supplying untrusted message configuration via any().messages(), prefs, validate options or Joi.extend can replace the compiled messages prototype, altering or breaking validation error rendering and dependent logic.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ References ]References
- github.com/hapijs/joi
- github.com/hapijs/joi/blob/v18.3.0/lib/messages.js
- github.com/hapijs/joi/commit/76f5771e1afe527cfda24be0e1a920ffa54888d6
- github.com/hapijs/joi/commit/dae9467cec27e787bfdea8b276595177d52d28ec
- github.com/hapijs/joi/pull/3164
- github.com/hapijs/joi/security/advisories/GHSA-6w3j-5fw6-r9vr
- www.vulncheck.com/advisories/joi-17.13.6-before-17.13.9-and-18.2.5-before-18.3.1-protot…