MediumGHSA-3pph-fpjx-jg34CVE-2026-8893228 Sep · 25 days ago
multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads.
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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 sh
Timeline
28 Sep25 daysfrom publication to Patchwire
- Published by GitHub advisory database28 Sep
- Seen by Patchwire23 Oct
- Fix released28 Sep
multer2.4.0
Versions of multer
2.x
safe 2.4.0
AffectedSafe
Related alerts(1)
Same packagesExploitable only if · read by Claude, the source remains the reference
- Project uses multer below version 2.5.0.
- multer is configured with an asynchronous fileFilter.
- The multer upload endpoint accepts requests from untrusted (including unauthenticated) clients.
- Affected
- multer >=2.0.0 <2.5.0
- Fixed in
- 2.5.0
- ID
- GHSA-q7qp-rjg7-q26m