MEDIUM 6.3 NVD
CVE-2026-122131
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
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.
References
- https://github.com/hapijs/joi
- https://github.com/hapijs/joi/blob/v18.3.0/lib/messages.js#L64-L67
- https://github.com/hapijs/joi/commit/76f5771e1afe527cfda24be0e1a920ffa54888d6
- https://github.com/hapijs/joi/commit/dae9467cec27e787bfdea8b276595177d52d28ec
- https://github.com/hapijs/joi/pull/3164
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-11-04 via NVD.
vulnfeed aggregates 16578 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.