CVE-2025-47935: high-severity vulnerability in expressjs multer
Multer vulnerable to Denial of Service via memory leaks from unclosed streams
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.8%
Multer is a node.js middleware for handling `multipart/form-data`. Versions prior to 2.0.0 are vulnerable to a resource exhaustion and memory leak issue due to improper stream handling. When the HTTP request stream emits an error, the internal `busboy` stream is not closed, violating Node.js stream safety guidance. This leads to unclosed streams accumulating over time, consuming memory and file descriptors. Under sustained or repeated failure conditions, this can result in denial of service, requiring manual server restarts to recover. All users of Multer handling file uploads are potentially impacted. Users should upgrade to 2.0.0 to receive a patch. No known workarounds are available.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
expressjs · multerRelated CVEs — expressjs multer
In the same product, most dangerous first.
CVE-2026-3520HIGHMulter vulnerable to Denial of Service via uncontrolled recursionEPSS 0.8%CVE-2025-47944HIGHMulter vulnerable to Denial of Service from maliciously crafted requestsEPSS 0.8%CVE-2025-7338HIGHMulter vulnerable to Denial of Service via unhandled exception from malformed requestEPSS 0.8%CVE-2026-3304HIGHMulter vulnerable to Denial of Service via incomplete cleanupEPSS 0.7%CVE-2026-2359HIGHMulter vulnerable to Denial of Service via resource exhaustionEPSS 0.7%CVE-2025-48997HIGHMulter vulnerable to Denial of Service via unhandled exceptionEPSS 0.5%