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EUVD-2026-317217

fkie_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.

GHSA-65x3-rw7q-gx94 — multiparty vulnerable to ReDoS via filename parsing

Affected: npm: multiparty

### 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)

UBUNTU-CVE-2026-8159

Affected: Ubuntu:16.04:LTS: node-multiparty, Ubuntu:18.04:LTS: node-multiparty, Ubuntu:20.04:LTS: node-multiparty, Ubuntu:22.04:LTS: node-multiparty, Ubuntu:24.04:LTS: node-multiparty, Ubuntu:25.10: node-multiparty, Ubuntu:26.04:LTS: node-multiparty