CVE-2026-42530 exploit

Exploit for CVE-2026-42530. CVSS 9.2.

Published 22 Sep 2026Updated 22 Sep 2026197 sources
CVSS 9.2 PoC CANDIDATE

What happened

Use-after-free in nginx 1.31.0/1.31.1 HTTP/3 module via duplicate QPACK encoder streams.

Affected versions

Unknown product: See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references