CVE-2026-8159

[email protected] and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to [email protected] or higher.

• https://cna.openjsf.org/security-advisories.html
• https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94
• https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS