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{"acknowledgement": "This issue was discovered by Found by AISLE in partnership with Red Hat.", "bugzilla": {"description": "stunnel: Stack-based out-of-bounds read/write in stunnel s_vlog via oversized log message", "id": "2462029", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462029"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-125", "details": ["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\"."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid exposing stunnel services to untrusted clients. Restrict access to these services to trusted networks only."}, "name": "CVE-2026-70368", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "stunnel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-04T10:30:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-70368\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-70368"], "statement": "This Moderate impact vulnerability affects stunnel services if their configuration allows long attacker-controlled log messages. Server-side IMAP protocol negotiation (\"protocol = imap\") is known to be affected, where a remote, unauthenticated attacker can trigger a denial-of-service by sending an oversized IMAP command. Reliable integrity impact or code execution as a result of this issue would be very difficult and likely impractical. This issue specifically affects \"stunnel\" 5.79 and lower when exposed to untrusted networks.", "threat_severity": "Moderate"}

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