CVE-2026-5038
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
multernpm | >= 2.0.0-alpha.1, < 2.2.0 | 2.2.0 |
multernpm | >= 3.0.0-alpha.1, < 3.0.0-alpha.2 | 3.0.0-alpha.2 |
Affected products
52.0.0-alpha.1 – 2.1.1, 3.0.0-alpha.1+ 3 more
- (no CPE)range: 2.0.0-alpha.1 – 2.1.1, 3.0.0-alpha.1
- cpe:2.3:a:expressjs:multer:3.0.0:alpha1:*:*:*:node.js:*:*
- cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*range: >=2.0.0,<2.2.0
- (no CPE)range: >=2.0.0-alpha.1 <=2.1.1 or >=3.0.0-alpha.1 <3.0.0-alpha.2
Patches
Vulnerability mechanics
References
4- cna.openjsf.org/security-advisories.htmlnvdVendor AdvisoryWEB
- github.com/advisories/GHSA-3p4h-7m6x-2hcmghsaADVISORY
- github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcmnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-5038ghsaADVISORY
News mentions
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