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

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Summary

CVECVE-2026-5038
StatePUBLISHED
Assigneropenjs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-15 16:16:34 UTC
Updated2026-06-15 16:16:34 UTC
DescriptionImpact: 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ce714d77-add3-4f53-aff5-83d477b104bb

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-459 | CWE-459 CWE-459: Incomplete Cleanup

VersionSourceTypeScoreSeverityVector
3.1ce714d77-add3-4f53-aff5-83d477b104bbSecondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNACVSS5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Multer Multer affected 2.0.0-alpha.1 2.2.0 semver Not specified
CNA Multer Multer unaffected 2.2.0 semver Not specified
CNA Multer Multer affected 3.0.0-alpha.1 3.0.0-alpha.2 semver Not specified
CNA Multer Multer unaffected 3.0.0-alpha.2 semver Not specified

References

ReferenceSourceLinkTags
cna.openjsf.org/security-advisories.html ce714d77-add3-4f53-aff5-83d477b104bb cna.openjsf.org
github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcm ce714d77-add3-4f53-aff5-83d477b104bb github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: yuki-matsuhashi (en)

CNA: HamdaanAliQuatil (en)

CNA: fasrm (en)

CNA: UlisesGascon (en)

CNA: bjohansebas (en)

CNA: 0xStraw-Hat (en)

CNA: bhaswanthc (en)

CNA: ByamB4 (en)

CNA: sbouabid-sec (en)

CNA: DavidCarliez (en)

CNA: JebeenLee (en)

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