CVE-2026-12200 Ritlabs TinyWeb Server Header libeay32.dll.html stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in Ritlabs TinyWeb Server via the Authorization header, potentially leading to code execution or service disruption.
- 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-2026-12200?
CVE-2026-12200 is a medium-severity memory corruption vulnerability in Ritlabs TinyWeb Server, published on 15 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security vulnerability has been detected in Ritlabs TinyWeb Server up to 1.94 on Win32. This impacts an unknown function in the library libeay32.dll.html of the component Header Handler. The manipulation of the argument Authorization leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-12200?
How do I fix CVE-2026-12200?
No fix has been published for CVE-2026-12200 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-2026-12200 being exploited?
There is no known exploitation of CVE-2026-12200 in the wild and no public exploit code.
Sources
Also known as GHSA-gpg8-377c-3rgp.