CVE-2026-8159

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 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 multiparty@4.3.0 or higher.

• CWE-1333

• https://cna.openjsf.org/security-advisories.htmlThird Party Advisory
• https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94Mitigation, Vendor Advisory
• https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoSNot Applicable

Published

May 12, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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