CVE-2026-113872
highpriority · track · 10EPSS 0.004 · 38 %ileexploit · PoCUSEPSS · scored 2026-10-28
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.
cvss
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base score 0–10 · higher = more severe · hover a vector to decode
ssvc
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weaknesses
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exploits (1)
Public proof-of-concept and weaponised exploit code.
affected products (1)
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advisories (1)
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- GHSA-q7qp-rjg7-q26mmulter vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardown2026-10-23ghsa · osvUS
### Impact When `multer` is configured with an asynchronous `fileFilter`, a single request can crash the Node.js process. If a request is aborted (for example when one file is rejected) while another file's async `fileFilter` is still pending, the pending callback later resumes a parsing stream that multer has already torn down. busboy then emits an error on a stream that no longer has an error listener, which Node raises as an unhandled `'error'` event, and the process exits. A single unauthenticated request is enough, so any application using `multer` with an asynchronous `fileFilter` is affected, regardless of storage engine. Uploads using a synchronous `fileFilter` are not affected. ### Patches Users should upgrade to `multer` `2.5.0` or later. ### Workarounds Use a synchronous `fileFilter`.
sources
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references (2) nvd
External citations — patches, advisories, analysis.
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