CVE-2026-78008 Fireware OS Authenticated Buffer Overflow in wgagent
An authenticated administrator can cause a denial of service or execute arbitrary code via a buffer overflow in the WatchGuard Fireware OS Management Web UI.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78008?
CVE-2026-78008 is a high-severity memory corruption vulnerability in WatchGuard Fireware OS, published on 27 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A buffer overflow vulnerability in the WatchGuard Fireware OS Management Web UI allows an authenticated administrator with network access to cause a denial of service (DoS) condition or potentially execute arbitrary code by sending specially crafted network traffic.
Weakness: CWE-787
Which versions are affected by CVE-2026-78008?
How do I fix CVE-2026-78008?
No fix has been published for CVE-2026-78008 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-2026-78008 being exploited?
There is no known exploitation of CVE-2026-78008 in the wild and no public exploit code.
Sources
Also known as GHSA-48wp-98wm-5fpp.