GHSA-5528-5vmv-3xc2

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

Source: GitHub Advisory Database (reviewed) High CVE-2026-3520

Packages

Ecosystem	Package	Affected	Fixed in
npm	multer	< 2.1.1	2.1.1

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. ### Patches Users should upgrade to `2.1.1` ### Workarounds None ### Resources - https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2 - https://www.cve.org/CVERecord?id=CVE-2026-3520 - https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752 - https://cna.openjsf.org/security-advisories.html

References

External links from the advisory. They lead to third-party sites.

https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2 web
https://nvd.nist.gov/vuln/detail/CVE-2026-3520 advisory
https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752 web
https://cna.openjsf.org/security-advisories.html web
https://github.com/expressjs/multer package
https://www.cve.org/CVERecord?id=CVE-2026-3520 web