Vulnerability · Published Jun 15, 2026 · Assigned by VulDB
CVE-2026-12200Ritlabs TinyWeb Server Header libeay32.dll.html stack-based overflow
High 7.3
In plain English
A high-severity stack buffer overflow in TinyWeb Server from Ritlabs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Ritlabs | TinyWeb Server | 1.01.11.21.31.41.51.61.7 |
Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
References
- VDB-370842 | Ritlabs TinyWeb Server Header libeay32.dll.html stack-based overflow vdb-entry, technical-description
- VDB-370842 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- CVE-2026-12200 | CVE Analysis and Report third-party-advisory
- Submit #829894 | RITLabs TinyWeb 1.94 Stack-based Buffer Overflow third-party-advisory
- https://nathan2.com/posts/tinyweb/ exploit