Executive brief
A security vulnerability exists in the Shibby Tomato firmware, which is software used to manage various home and small office routers. An attacker on the local network can exploit this flaw to trick the router into revealing sensitive information stored in its memory. This could potentially expose private data or details about the router's operations to an unauthorized user. This product is no longer supported, and users are encouraged to migrate to the FreshTomato project.
Technical details
An out-of-bounds read vulnerability exists in the miniupnpd component (specifically the SUBSCRIBE Call Handler) of Shibby Tomato firmware version 1.28. The root cause is located in the 'send' function within usr/sbin/miniupnpd, where the daemon fails to validate the length of a formatted NOTIFY request against its fixed 1024-byte (0x400) heap buffer. By providing a specially crafted, long callback URI in a SUBSCRIBE request, an unauthenticated attacker on the LAN can cause snprintf() to return a value larger than the buffer size. Subsequent calls to send() use this unchecked length, resulting in the transmission of adjacent heap memory back to the attacker's listener. While initially categorized as SSRF (CWE-918), the primary impact is information disclosure (CWE-200) of sensitive heap data.
Affected products
- Shibby Tomato by Shibby 1.28
Timeline
- 2026-04-22: disclosed: Vulnerability reported by Fengyi Wang via Gitee.
- 2026-05-29: advisory: CVE-2026-10068 published.