CVE-2026-90771CWE-1321

CVE-2026-90771

Low · published September 13, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
31.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
6.3 · 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
0.00389 · 31.8th percentile
Weakness
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Published
2026-09-13T15:17Z
References (6)
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]https://github.com/hapijs/joi/issues/3150 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 15 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 13 SEP 10:45Z
    joi before 17.13.8 and 18.2.9 Prototype Pollution via messages
    cvelistv5