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

GHSA-3p4h-7m6x-2hcm · CVE-2026-5038

Published Jun 17, 2026 · Modified Jun 17, 2026

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Description

Impact

A vulnerability in Multer allows an attacker to trigger a Denial of Service (DoS) by aborting or sending malformed multipart uploads, causing orphaned partial files to accumulate on disk when using diskStorage.

Patches

Users should upgrade to 2.2.0, 3.0.0-alpha.2 or higher

Workarounds

None

References

WEB https://github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcm
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-5038
WEB https://cna.openjsf.org/security-advisories.html
PACKAGE https://github.com/expressjs/multer

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