WatchGuard security advisory (AV26-981)

Serial number: AV26-981Date: October 1, 2026 As of September 30, 2026, WatchGuard is affected by a vulnerability in the following product: Fireware OS Prior to 12.12.3 Prior to 12.5.21 Prior to 2026.2.3 Prior to 2026.3.2 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. CVE-2026-86134 — Fireware OS Pre-Authentication NULL Pointer Dereference Allows Remote Denial of Service WatchGuard Security Advisories