Vulnerability · Published Aug 27, 2026 · Assigned by WatchGuard
CVE-2026-19316Fireware OS Pre-Authentication Double Free in iked Allows Denial of Service (DoS)
High 8.7
In plain English
A high-severity double free in Fireware OS from WatchGuard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.5%top 54.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A double-free vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WatchGuard | Fireware OS | 2025.0 – before 2026.2.212.0 – before 12.12.22026.3 – before 2026.3.1 |
| WatchGuard | Fireware OS | 12.0 – before 12.5.20 |
Weakness: CWE-415, CWE-416 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://psirt.watchguard.com/CVE-2026-19316 vendor-advisory