CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-5038
High (7.5) in expressjs multer. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in multer 2.2.0, 3.0.0-alpha.2.
Impact: multer versions 2.0.0-alpha.1 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service when using diskStorage. Aborted or malformed multipart uploads leave orphaned partial files on disk because the Readable.pipe() call does not propagate the stream destroy signal to
the underlying fs.WriteStream. An attacker can exhaust disk space by triggering many aborted uploads, with no application bug required.
Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease). Both versions track in-flight write streams and clean them up on the abort path.
Workarounds: None.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-31)
- CWE
- CWE-459
- Published
- Modified
- Record from
- the NVD, synced
Affected
- expressjs:multer
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3p4h-7m6x-2hcm | npm | multer | >=2.0.0-alpha.1 <2.2.0 | 2.2.0 |
| GHSA-3p4h-7m6x-2hcm | npm | multer | >=3.0.0-alpha.1 <3.0.0-alpha.2 | 3.0.0-alpha.2 |