No VulnCrest analysis published for this CVE yet. Below is the original CNA/NVD description, unmodified.
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.
Exploits & detection
No public PoC or detection template found yet.
Timeline
- Published: 04 Nov 2026
- Last modified upstream: 04 Nov 2026
Sources & licenses
- CVE / CVSS / CWE
- NVD record ↗ (unmodified). This product uses the NVD API but is not endorsed or certified by the NVD. CVE® © The MITRE Corporation.
- Exploitation
- CISA KEV (CC0) · EPSS by FIRST.org
- References used for the analysis
- 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
- https://github.com/hapijs/joi/security/advisories/GHSA-6w3j-5fw6-r9vr
- https://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-key
- Analysis, summary and remediation
- © VulnCrest