CVE-2026-8159

Description

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.

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Produits concernés

• multiparty
• Pillarjs multiparty

Scores CVSS

Faiblesses (CWE)

• CWE-1333

Références

• https://cna.openjsf.org/security-advisories.html Third Party Advisory
• https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94 MitigationVendor Advisory
• https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS Not Applicable

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories