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CVE-2026-5038

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

Published: Jun 15, 2026Updated: Jun 16, 2026 Sources: CVE List NVDCWE-459
5.3MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 80.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-459

Affected Products

expressjs
oss-projectaka express
multerLibrary
OSS Libraries / web-framework
multer
oss-project
multerLibrary
OSS Libraries / npm

Exploitability

Official Patch Available

References

https://cna.openjsf.org/security-advisories.html
cna.openjsf.org
https://github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcm
github.com

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