CVE-2026-19318 Fireware OS Pre-Authentication Stack Buffer Overflow in iked Allows Remote Code Execution
Remote unauthenticated attackers can execute arbitrary code on WatchGuard Fireware OS devices via a stack buffer overflow 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-2026-19318?
CVE-2026-19318 is a critical memory corruption 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 stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.
Which versions are affected by CVE-2026-19318?
How do I fix CVE-2026-19318?
No fix has been published for CVE-2026-19318 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-19318 being exploited?
There is no known exploitation of CVE-2026-19318 in the wild and no public exploit code.
Sources
Also known as GHSA-hj2q-w426-x635.