CVE-2026-90771
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 6.3
- CVSS 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
- EPSS probability
- 0.26%
- CWE
- CWE-1321
- Published
- 2026-09-13
- Last modified
- 2026-09-16
Affected products
- hapijs joi
- hapijs joi
Weakness type
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