CVE-2026-5038: Multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads

June 17, 2026

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.

References

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

Code Behaviors & Features

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