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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.

PUBLISHED Reserved 2026-03-27 | Published 2026-06-15 | Updated 2026-06-15 | Assigner openjs




MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-459: Incomplete Cleanup

Product status

Default status
unaffected

2.0.0-alpha.1 (semver) before 2.2.0
affected

2.2.0 (semver)
unaffected

3.0.0-alpha.1 (semver) before 3.0.0-alpha.2
affected

3.0.0-alpha.2 (semver)
unaffected

Credits

yuki-matsuhashi remediation reviewer

HamdaanAliQuatil finder

fasrm finder

UlisesGascon remediation developer

bjohansebas remediation reviewer

0xStraw-Hat finder

bhaswanthc finder

ByamB4 finder

sbouabid-sec finder

DavidCarliez finder

JebeenLee finder

References

github.com/...multer/security/advisories/GHSA-3p4h-7m6x-2hcm

cna.openjsf.org/security-advisories.html

cve.org (CVE-2026-5038)

nvd.nist.gov (CVE-2026-5038)

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