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.
Published: 2026-09-13
Score: 6.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sun, 13 Sep 2026 11:00:00 +0000

Type Values Removed Values Added
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.
Title joi before 17.13.8 and 18.2.9 Prototype Pollution via messages
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': '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'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-13T10:45:42.498Z

Reserved: 2026-09-13T10:14:57.680Z

Link: CVE-2026-90771

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-13T11:17:01.613

Modified: 2026-09-13T11:17:01.613

Link: CVE-2026-90771

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses