GHSA-65x3-rw7q-gx94HighCVSS 7.5
multiparty vulnerable to ReDoS via filename parsing
🔗 CVE IDs covered (1)
📋 Description
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
🎯 Affected products1
- npm/multiparty:<= 4.2.3
🔗 References (6)
- https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94
- https://nvd.nist.gov/vuln/detail/CVE-2026-8159
- https://cna.openjsf.org/security-advisories.html
- https://github.com/pillarjs/multiparty/releases/tag/v4.3.0
- https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS
- https://github.com/advisories/GHSA-65x3-rw7q-gx94