GHSA-qvfw-j98x-7q72

Source

https://github.com/advisories/GHSA-qvfw-j98x-7q72

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-qvfw-j98x-7q72/GHSA-qvfw-j98x-7q72.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-qvfw-j98x-7q72

Aliases

CVE-2026-77063

Downstream

MINI (3)

Published

2026-09-08T21:29:42Z

Modified

2026-09-08T21:45:04Z

Severity

3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator

Summary

multer vulnerable to file size limit bypass via async fileFilter race condition

Details

Impact

When multer is configured with an asynchronous fileFilter, the limits.fileSize limit can be bypassed. The 'limit' event is registered inside the async fileFilter callback, so if a file exceeds limits.fileSize before that callback runs, the event is missed and the oversized upload is accepted instead of being rejected with a LIMIT_FILE_SIZE error. Applications that rely on limits.fileSize to reject oversized uploads are affected on all upload methods (.single(), .array(), .fields(), .any()). Uploads using a synchronous fileFilter are not affected.

Patches

Users should upgrade to 2.3.0.

Workarounds

Use a synchronous fileFilter, or validate the uploaded file size after the upload completes.

Database specific

{
    "cwe_ids": [
        "CWE-362"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-08T21:29:42Z",
    "nvd_published_at": "2026-08-28T22:16:53Z",
    "severity": "LOW"
}

References

Affected packages

npm / multer

Package

Name: multer; View open source insights on deps.dev
Purl: pkg:npm/multer

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.3.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-qvfw-j98x-7q72/GHSA-qvfw-j98x-7q72.json"