CVE-2026-70368

Descripción

A stack-based out-of-bounds read vulnerability exists in the -s_vlog- function of stunnel, when handling oversized log messages via -vsnprintf-. A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing -\n- characters with -\0-.