CVE-2026-90771
Low · 3.7CVSS
3.7
EPSS
0.4%
Published
Sep 13, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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