PT-2026-49242 · Multer · Multer

0Xstraw-Hat + 10 · Published 2026-06-15 · Updated 2026-06-15 · CVE-2026-5038

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Fix

Weakness Enumeration

CWE-459

Related Identifiers

CVE-2026-5038

Affected Products

Multer

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-5038 · Security Note
• https://cna.openjsf.org/security-advisories.html · Note
• https://github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcm · Note