CVE-2026-113872 · GHSA-q7qp-rjg7-q26m
multer vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardown
- Risk score
- 62/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 22 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- multer is a middleware for Node.js that handles multipart/form-data file uploads. In versions from 2.0.0 before 2.5.0, when multer is configured with an asynchronous fileFilter, a single request can crash the Node.js process. If the request is aborted while one file's asynchronous fileFilter is still pending, the pend…
- Affected
- See advisory
- Fix
- Upgrade multer to 2.5.0 or later.
- Exploitation
- No known exploitation
Story map
At a glance
multer: Amber, patch this week. multer is a middleware for Node.js that handles multipart/form-data file uploads. In versions from 2.0.0 before 2.5.0, when multer is configured with an asynchronous fileFilter, a single request can crash the Node.js process. If the request is aborted while one file's asynchronous fileFilter is still pending, the pend…
The flaws
- CVE-2026-113872: Multer vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardown (CVSS 7.5 · EPSS 0%)
- CVE-2026-88932: Multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads (CVSS 5.3 · EPSS 1%)
The fix
Upgrade multer: 2.5.0 or later on your release line
Who is exposed: See advisory
Where it stands
- No known exploitation
Connects to
- Same weakness: CWE-248 (CWE-248). 63 other warnings in 30 days
Why it is Amber
- CVSS 7.5 high
- Remotely exploitable without logging in
- On your watchlist: npm
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| multer | npm | >= 2.0.0, < 2.5.0 | 2.5.0 |
References
- https://cna.openjsf.org/security-advisories.html
- https://github.com/expressjs/multer/security/advisories/GHSA-q7qp-rjg7-q26m
- https://github.com/advisories/GHSA-q7qp-rjg7-q26m
- https://nvd.nist.gov/vuln/detail/CVE-2026-113872
- https://github.com/expressjs/multer/commit/80a2d9df1dfd63b5fab631b8b9966164ed647adf
- https://github.com/expressjs/multer/releases/tag/v2.5.0
- https://github.com/advisories/GHSA-q7qp-rjg7-q26m
Original description
multer is a middleware for Node.js that handles multipart/form-data file uploads. In versions from 2.0.0 before 2.5.0, when multer is configured with an asynchronous fileFilter, a single request can crash the Node.js process. If the request is aborted while one file's asynchronous fileFilter is still pending, the pending callback later resumes a parsing stream that multer has already torn down, and the underlying parser emits an error on a stream that no longer has an error listener, which Node raises as an unhandled error event so the process exits. Any application using multer with an asynchronous fileFilter is affected regardless of storage engine, while uploads using a synchronous fileFilter are not affected. The issue is fixed in multer 2.5.0, and users should upgrade to 2.5.0 or later. As a workaround, use a synchronous fileFilter.
Last activity 23 Oct 2026. Patch Forecast updates every hour.