CVE-2026-15544 Shibby Tomato apcupsd tomatodata.cgi getupsvar stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the apcupsd component of Shibby Tomato firmware to execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15544?
CVE-2026-15544 is a high-severity memory corruption vulnerability in Shibby Tomato, published on 13 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in Shibby Tomato up to 1.28.0000. Affected is the function getupsvar of the file www/apcupsd/tomatodata.cgi of the component apcupsd. This manipulation of the argument Field causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized. This project is superseded by FreshTomato.
Which versions are affected by CVE-2026-15544?
How do I fix CVE-2026-15544?
No fix has been published for CVE-2026-15544 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-2026-15544 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15544 exists.
Sources
Also known as GHSA-hp2q-5cpp-5m3x.