CVE-2026-19316 Fireware OS Pre-Authentication Double Free in iked Allows Denial of Service (DoS)
Remote unauthenticated attackers can cause a denial of service in WatchGuard Fireware OS VPN processing via a double-free vulnerability in the iked process.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19316?
CVE-2026-19316 is a high-severity use after free vulnerability in WatchGuard Fireware OS, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-19316?
How do I fix CVE-2026-19316?
No fix has been published for CVE-2026-19316 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-19316 being exploited?
There is no known exploitation of CVE-2026-19316 in the wild and no public exploit code.
Sources
Also known as GHSA-r6p9-hmgr-2w5p.