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CVE-2026-90771 Details

Description

joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code. Attackers can supply __proto__ keys in custom messages to replace the returned object's prototype, breaking downstream code relying on Object.prototype methods.

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/issues/3150	CISA-ADP
https://github.com/hapijs/joi	[email protected]
https://github.com/hapijs/joi/blob/v18.2.8/lib/messages.js	[email protected]
https://github.com/hapijs/joi/commit/5b8333c9177e08b4ef4ed02903c2d657084e7afb	[email protected]
https://github.com/hapijs/joi/issues/3150	[email protected]
https://www.vulncheck.com/advisories/joi-before-17.13.8-and-18.2.9-prototype-pollution-via-messages	[email protected]

see all 6 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
Sep 16, 2026	CVE Modified	CISA-ADP
Sep 13, 2026	New CVE Received	[email protected]