# CVE-2026-77063

## Summary

- **CVE ID:** CVE-2026-77063
- **Severity:** LOW
- **CVSS Score:** 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-362
- **Published:** Aug 28, 2026
- **Last Modified:** Aug 31, 2026

## Description

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.

## Affected Products

- multer — multer (0)
- multer — multer (2.3.0)

## References

- [CNA](https://github.com/expressjs/multer/security/advisories/GHSA-qvfw-j98x-7q72)
- [CNA](https://cna.openjsf.org/security-advisories.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._