Incomplete cleanup in multer - CVE-2026-88932
Published: September 15, 2026
Vulnerability identifier: #VU150003
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-88932
CWE-ID: CWE-459
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to incomplete cleanup in multer's diskStorage when handling aborted multipart uploads before a file path is assigned. A remote attacker can send aborted upload requests to accumulate orphaned files and exhaust disk space.
An asynchronous destination or filename configuration widens the exposure window.
Affected software
multer
How to mitigate CVE-2026-88932
Install security update from vendor's website.
multer - update to 2.4.0