multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads
### Impact Multer's `diskStorage` can leave complete, orphaned files on disk when a multipart upload is aborted in the brief window before the storage engine assigns the file path. This is an incomplete fix of CVE-2026-5038: the earlier cleanup removes only in-flight uploads that already have a path, so an upload aborted inside that window is written to disk with nothing left to remove it, and the application is not given a handle to clean it up. An unauthenticated attacker sending aborted requests to any route backed by disk storage can accumulate orphaned files until the upload directory or the shared system temporary directory is exhausted. An asynchronous `destination` or `filename` widens the window. ### Patches Users should upgrade to `2.4.0` or higher. ### Workarounds None.
GHSA-3pph-fpjx-jg34
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-3pph-fpjx-jg34
multer
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 2.4.0
Source reference:
/affected/0/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": "2.2.0"
},
{
"fixed": "2.4.0"
}
]
}
],
"package": {
"name": "multer",
"purl": "pkg:npm/multer",
"ecosystem": "npm"
},
"database_specific": {
"source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-3pph-fpjx-jg34/GHSA-3pph-fpjx-jg34.json"
}
}
]- Related CVEs
- CVE-2026-88932
Source reference:
/aliases
Publisher severity
No explicit severity was provided.
- Event
- #23691 · Revision 1
- Added to Heist Feed
- Publisher date