Medium
joi before 17.13.8 and 18.2.9 Prototype Pollution via messages
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.
Announced Group revision 1
Original source ↗CVE-2026-90771
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90771
joi
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "hapijs",
"product": "joi",
"versions": [
{
"status": "affected",
"version": "16.0.0",
"lessThan": "17.13.8",
"versionType": "semver"
},
{
"status": "affected",
"version": "18.0.0",
"lessThan": "18.2.9",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/joi",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-90771
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #1632 · Revision 1
- Added to Heist Feed
- Publisher date