traverse: set() can write to built-in prototypes via an untrusted path
traverse (npm) versions 0.3.6 through 0.3.9, 0.4.0 through 0.4.6, 0.5.0 through 0.5.2, and 0.6.0 through 0.6.11 allow prototype pollution through set(). When the path passed to set() crosses a primitive value, the next path segment is resolved on that primitive's built-in prototype, so an application that passes an untrusted path to set() lets an attacker add or overwrite properties of String.prototype, Number.prototype, or Boolean.prototype using plain JSON data, for example traverse({ name: 'bob' }).set(['name', '__proto__', 'polluted'], 'yes'). Object.prototype was reachable only with a non-data path segment, such as an object whose toString returns a different value on each call, or through a Proxy that accepts an assignment without storing it. This is fixed in 0.3.10, 0.4.7, 0.5.3, and 0.6.12.
CVE-2026-107353
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-2026-107353
traverse
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.
[
{
"repo": "https://github.com/ljharb/js-traverse",
"vendor": "ljharb",
"product": "traverse",
"versions": [
{
"status": "affected",
"version": "0.3.6",
"lessThan": "0.3.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "0.4.0",
"lessThan": "0.4.7",
"versionType": "semver"
},
{
"status": "affected",
"version": "0.5.0",
"lessThan": "0.5.3",
"versionType": "semver"
},
{
"status": "affected",
"version": "0.6.0",
"lessThan": "0.6.12",
"versionType": "semver"
}
],
"packageName": "traverse",
"collectionURL": "https://www.npmjs.com",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "set"
}
]
}
]- Related CVEs
- CVE-2026-107353
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12296 · Revision 1
- Added to Heist Feed
- Publisher date