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Prototype Pollution EUVDEUVD-2026-76992

| CVE-2026-90771 MEDIUM
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-09-13 VulnCheck GHSA-wr44-6hxh-3jwq
Information Disclosure Prototype Pollution Joi
6.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulnCheck) · only source for this CVE.

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Sep 13, 2026 - 11:27 vuln.today
Analysis Generated
Sep 13, 2026 - 11:27 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Prototype pollution in hapijs/joi's messages compilation function allows network-reachable attackers to replace an object's prototype chain by supplying __proto__ as an error-code key in custom validation messages. Affected versions are joi before 17.13.8 and before 18.2.9. …

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EUVD-2026-76992 vulnerability details – vuln.today
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