joi messages compilation allows prototype replacement through __proto__ error codes
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.
GHSA-wr44-6hxh-3jwq
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: osv:GHSA-wr44-6hxh-3jwq
joi
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 17.13.8
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
joi
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 18.2.9
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "17.13.8"
}
]
}
],
"package": {
"name": "joi",
"purl": "pkg:npm/joi",
"ecosystem": "npm"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-wr44-6hxh-3jwq/GHSA-wr44-6hxh-3jwq.json"
}
},
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "18.0.0"
},
{
"fixed": "18.2.9"
}
]
}
],
"package": {
"name": "joi",
"purl": "pkg:npm/joi",
"ecosystem": "npm"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-wr44-6hxh-3jwq/GHSA-wr44-6hxh-3jwq.json"
}
}
]- Related CVEs
- CVE-2026-90771
Source reference:
/aliases
Publisher severity
medium
Source reference: /severity/1/score
- Event
- #85946 · Revision 1
- Added to Heist Feed
- Publisher date