Threats affecting pkg:npm/multer

A vulnerability in multer versions 2.0.0 through before 2.5.0 allows a Node.js process to crash when using an asynchronous fileFilter. If a request is aborted while the asynchronous fileFilter is pending, an unhandled error event occurs due to a resumed parsing stream without an error listener, causing the process to exit. This issue is fixed in multer 2.5.0.

Multer's diskStorage engine has a vulnerability where aborted multipart uploads can leave orphaned files on disk. This occurs in a brief window before the storage engine assigns the file path, allowing unauthenticated attackers to cause denial of service by exhausting disk space. The issue affects versions from 2.2.0 up to but not including 2.4.0. The vulnerability is a partial regression of a previous fix (CVE-2026-5038). No workarounds are available, but upgrading to version 2.4.0 or higher resolves the issue.

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.2 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.2 to receive a patch. No known workarounds are available.

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.1 allows an attacker to trigger a Denial of Service (DoS) by sending an upload file request with an empty string field name. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to `2.0.1` to receive a patch. No known workarounds are available.