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CVE-2026-122131 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/hapijs/joi	[email protected]
https://github.com/hapijs/joi/blob/v18.3.0/lib/messages.js#L64-L67	[email protected]
https://github.com/hapijs/joi/commit/76f5771e1afe527cfda24be0e1a920ffa54888d6	[email protected]
https://github.com/hapijs/joi/commit/dae9467cec27e787bfdea8b276595177d52d28ec	[email protected]
https://github.com/hapijs/joi/pull/3164	[email protected]
https://github.com/hapijs/joi/security/advisories/GHSA-6w3j-5fw6-r9vr	[email protected]
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	[email protected]

see all 7 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1321	Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 5, 2026	CVE Modified	CISA-ADP
Nov 4, 2026	New CVE Received	[email protected]