CVE-2026-77063
- Source
- https://cve.org/CVERecord?id=CVE-2026-77063
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77063.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-77063
- Aliases
-
- GHSA-qvfw-j98x-7q72
- Published
- 2026-08-28T19:54:58.473Z
- Modified
- 2026-09-05T03:48:00.658542071Z
- 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
-
multer is a middleware for handling multipart/form-data in Node.js. When an application uses an asynchronous fileFilter together with the fileSize limit, a race condition in multer's file stream handling can allow a file that exceeds the configured size limit to bypass the size-limit rejection. All versions before 2.3.0 are affected. The impact is limited because the underlying multipart parser still truncates the stream at the size limit, so this is a bypass of the limit rejection rather than uncontrolled resource consumption. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
- Database specific
{ "cwe_ids": [ "CWE-362" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77063.json", "cna_assigner": "openjs" }- References
Affected packages
Git / github.com/expressjs/multer
Affected ranges
- Type
- GIT
- Repo
- https://github.com/expressjs/multer
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
-
Show details
{ "cpe": "cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*", "source": [ "AFFECTED_FIELD", "CPE_RANGE" ], "extracted_events": [ { "introduced": "0" }, { "fixed": "2.3.0" } ] }