multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads
Impact
Multer's diskStorage can leave complete, orphaned files on disk when a multipart upload is aborted in the brief window before the storage engine assigns the file path. This is an incomplete fix of CVE-2026-5038: the earlier cleanup removes only in-flight uploads that already have a path, so an upload aborted inside that window is written to disk with nothing left to remove it, and the application is not given a handle to clean it up. An unauthenticated attacker sending aborted requests to any route backed by disk storage can accumulate orphaned files until the upload directory or the shared system temporary directory is exhausted. An asynchronous destination or filename widens the window.
Patches
Users should upgrade to 2.4.0 or higher.
Workarounds
None.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | multer | >= 2.2.0, < 2.4.0 | 2.4.0 |
References
- 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
- https://github.com/expressjs/multer/releases/tag/v2.4.0
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- Weakness (CWE)
CWE-400, CWE-459- Platform
- npm
- Package
multer- Disclosed
- 28.09.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-3pph-fpjx-jg34 - CC BY 4.0
Vulnerability history: multer
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 05.2025 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 11
- Medium 2
- Low 1
Disclosures per year
- 2025: 4
- 2026: 10
-
multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads this entry
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