multer vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardown
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.
CVE-2026-113872
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-113872
multer
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "multer",
"product": "multer",
"versions": [
{
"status": "affected",
"version": "2.0.0",
"lessThan": "2.5.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "2.5.0",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/multer",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-113872
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #52308 · Revision 1
- Added to Heist Feed
- Publisher date