MEDIUM 6.5 NVD
CVE-2026-70368
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 attack
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".
References
- https://access.redhat.com/security/cve/CVE-2026-70368
- https://bugzilla.redhat.com/show_bug.cgi?id=2462029
This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-08-04 via NVD.
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