Bug 2488935 (CVE-2026-5038) - CVE-2026-5038 multer: Multer: Denial of Service via aborted or malformed multipart uploads
Summary: CVE-2026-5038 multer: Multer: Denial of Service via aborted or malformed mult...
Keywords:
Status: NEW
Alias: CVE-2026-5038
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2526574 2526575 2526576 2526577 2526578 2526579 2526580 2526581 2526582
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-15 16:01 UTC by OSIDB Bzimport
Modified: 2026-08-31 22:22 UTC (History)
27 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-06-15 16:01:42 UTC 
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.
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