GHSA-65x3-rw7q-gx94
multiparty vulnerable to ReDoS via filename parsing
Quick fix
GHSA-65x3-rw7q-gx94 — multiparty: upgrade to the fixed version with the command below.
npm install multiparty@4.3.0Details
### Impact
multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the `Content-Disposition` filename parameter parser. A multipart upload with a long header value containing `!filename="1` repeated can cause regex matching to take seconds, blocking the event loop. Any service accepting multipart uploads via multiparty is affected.
### Patches
Users should upgrade to multiparty@4.3.0 or higher.
### Workarounds
None. Limiting upload sizes at the proxy/gateway layer reduces but does not eliminate the attack surface, since a small ~8 KB header is sufficient to trigger the vulnerable backtracking.
### Resources
- [OWASP: Regular expression Denial of Service (ReDoS)](https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS)
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-8159[ADVISORY]
- https://cna.openjsf.org/security-advisories.html[WEB]
- https://github.com/pillarjs/multiparty[PACKAGE]
- https://github.com/pillarjs/multiparty/releases/tag/v4.3.0[WEB]
- https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS[WEB]