medium5.3
CVE-2026-88932
multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads
Impact
multer is a Node.js middleware for handling multipart/form-data uploads. In versions 2.2.0 through 2.3.0, when a request using disk storage is aborted mid-upload, file writes that complete after multer has already run its abort cleanup are not removed, so each aborted upload can leave an orphaned file on disk. A remote unauthenticated attacker can repeatedly start and abort uploads to accumulate orphaned files and exhaust disk space, causing a denial of service. The issue is fixed in multer 2.4.0, and users should upgrade to 2.4.0 or later.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | multer | >= 2.2.0, < 2.4.0 | 2.4.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-3pph-fpjx-jg34
- https://github.com/expressjs/multer/security/advisories/GHSA-3pph-fpjx-jg34
- https://nvd.nist.gov/vuln/detail/CVE-2026-88932
- https://github.com/expressjs/multer/commit/53337f9713619ef3381ee6b4e541f926dbaac305
- https://cna.openjsf.org/security-advisories.html
- https://github.com/expressjs/multer/releases/tag/v2.4.0