CVE-2026-90771joi before 17.13.8 and 18.2.9 Prototype Pollution via messages
Updated under an hour ago ()
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It affects hapijs joi. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
hapijs joi hapijs:joi (from the name) | from 16.0.0 before 17.13.8; from 18.0.0 before 18.2.9 | CNA record |
References
- https://github.com/hapijs/joi/issues/3150issue-tracking
- https://github.com/hapijs/joiproduct
- https://github.com/hapijs/joi/blob/v18.2.8/lib/messages.jstechnical-description
- https://github.com/hapijs/joi/commit/5b8333c9177e08b4ef4ed02903c2d657084e7afbpatch
- https://www.vulncheck.com/advisories/joi-before-17.13.8-and-18.2.9-prototype-pollution-via-messagesthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.