Low severity3.7NVD Advisory· Published Nov 4, 2026
CVE-2026-122131
CVE-2026-122131
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.
Affected products
1Patches
Vulnerability mechanics
References
6- github.com/hapijs/joi/blob/v18.3.0/lib/messages.jsnvd
- github.com/hapijs/joi/commit/76f5771e1afe527cfda24be0e1a920ffa54888d6nvd
- github.com/hapijs/joi/commit/dae9467cec27e787bfdea8b276595177d52d28ecnvd
- github.com/hapijs/joi/pull/3164nvd
- github.com/hapijs/joi/security/advisories/GHSA-6w3j-5fw6-r9vrnvd
- www.vulncheck.com/advisories/joi-17.13.6-before-17.13.9-and-18.2.5-before-18.3.1-prototype-replacement-via-proto-language-keynvd
News mentions
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