CVE-2026-77037

Summary

multer vulnerable to Denial of Service via file descriptor leak on aborted uploads

Severity

high

CVSS

7.5

EPSS

0.3% (p28)

CWE

CWE-400, CWE-459

Also known as

GHSA-qfvm-cv95-jqjf

Published

2026-09-08

Updated

2026-09-08

Advisory details

Impact

A vulnerability in multer 2.2.0 allows an attacker to trigger a Denial of Service (DoS) by aborting or truncating multipart uploads. When using diskStorage, the destination write stream is not closed if the upload is aborted before it finishes, so each failed request leaks an open file descriptor and retains its disk blocks until the process exits. Repeated failed uploads can exhaust the available file descriptors. All applications using multer's disk storage are affected.

Patches

Users should upgrade to 2.3.0.

Workarounds

None.

References

• https://github.com/advisories/GHSA-qfvm-cv95-jqjf
• https://github.com/expressjs/multer/security/advisories/GHSA-qfvm-cv95-jqjf
• https://nvd.nist.gov/vuln/detail/CVE-2026-77037
• https://github.com/expressjs/multer/commit/eef74440b491ef0f976f3d25895e8089ae495df0
• https://cna.openjsf.org/security-advisories.html
• https://github.com/expressjs/multer/releases/tag/v2.3.0

Related advisories

• CVE-2026-82333 — high · npm/multer
• CVE-2026-77078 — high · npm/multer
• CVE-2026-5079 — high · npm/multer
• CVE-2026-5038 — medium · npm/multer
• CVE-2026-55247 — critical · PyPI/plone.app.event
• CVE-2026-55248 — critical · PyPI/plone.app.portlets
• GHSA-68r5-9hpg-7qw9 — critical · Maven/org.openidentityplatform.opendj:opendj-dsml-servlet
• CVE-2021-44228 — critical · Maven/org.ops4j.pax.logging:pax-logging-log4j2

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