CVE-2026-70368 | BDVDB-2026-355222 Detail

Description#

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".

Impact#

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Exploit#

History#

1. Version 12026-08-04Record published in the CVE List.
2. Version 22026-11-05Most recent update recorded in the CVE List.