{"id":"CVE-2026-70368","published":"2026-08-04T14:16:32.693","lastModified":"2026-08-06T15:37:22.093","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\".","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","cwes":["CWE-125"],"vendors":[],"products":[],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-70368","tags":[]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462029","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The flaw is a stack-based out-of-bounds read vulnerability in stunnel's 's_vlog' function when handling oversized log messages. This can lead to crashes and potentially replace trailing newline characters with null bytes.","exploitability":"Exploitation requires network access to the stunnel service and sending protocol inputs that trigger a log message longer than 1024 bytes, making it moderately difficult.","blast_radius":"If exploited, this could result in service disruptions or data corruption, impacting system reliability.","remediation":"Update stunnel to a patched version immediately.","tags":["stack-overflow","log-vulnerability","crash"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-08-11T07:05:32.756Z"}}