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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-5038

multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
openjs

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

multer multer

Default version status: unaffected

  • 2.0.0-alpha.1 to < 2.2.0affected
  • 2.2.0unaffected
  • 3.0.0-alpha.1 to < 3.0.0-alpha.2affected
  • 3.0.0-alpha.2unaffected
pkg:npm/multer

References