CVE-2026-5038: medium-severity vulnerability in multer
multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
multer · multerRelated CVEs — multer
In the same product, most dangerous first.
CVE-2026-88932MEDIUMmulter vulnerable to Denial of Service via orphaned disk writes on aborted uploadsEPSS 0.5%CVE-2026-77078HIGHmulter vulnerable to Denial of Service via crafted multipart field namesEPSS 0.5%CVE-2026-77037HIGHmulter vulnerable to Denial of Service via file descriptor leak on aborted uploadsEPSS 0.5%CVE-2026-113872HIGHmulter vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardownEPSS 0.4%CVE-2026-82333HIGHmulter vulnerable to Denial of Service via oversized array index in field namesEPSS 0.4%CVE-2026-5079HIGHmulter vulnerable to Denial of Service via deeply nested field namesEPSS 0.3%