{"id":"CVE-2026-25791","summary":"Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service","details":"Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP bootstrap messages and allocates server-side DNS sessions without validating OTP values, even when EnforceOTP is enabled. Because sessions are stored without a cleanup/expiry path in this flow, an unauthenticated remote actor can repeatedly create sessions and drive memory exhaustion. This vulnerability is fixed in 1.7.0.","aliases":["GHSA-wxrw-gvg8-fqjp","GO-2026-4466"],"modified":"2026-05-18T05:58:37.242442969Z","published":"2026-02-09T20:34:31.144Z","related":["SUSE-SU-2026:0757-1"],"database_specific":{"cwe_ids":["CWE-306","CWE-400"],"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25791.json"},"references":[{"type":"WEB","url":"https://github.com/BishopFox/sliver/releases/tag/v1.7.0"},{"type":"ADVISORY","url":"https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjp"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25791.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25791"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bishopfox/sliver","events":[{"introduced":"0"},{"fixed":"0bef5491dcca31485962e49cbf15cdda8c37a3f7"}]}],"versions":["v1.6.11","v1.6.10","v1.6.9","v1.6.8","v1.6.7","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.30","v1.5.29","v1.5.28","v1.5.27","v1.5.26","v1.5.25","v1.5.23","v1.5.24","v1.5.22","v1.5.21","v1.5.20","v1.5.19","v1.5.18","v1.5.17","v1.5.16","v1.5.15","v1.5.14","v1.5.13","v1.5.12","v1.5.11","v1.5.10","v1.5.9","v1.5.7","v1.5.8","v1.5.6","v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.21","v1.4.20","v1.4.19","v1.4.18","v1.4.17","v1.4.16","v1.4.15","v1.4.14","v1.4.13","v1.4.12","v1.4.10","v1.4.9","v1.4.8","v1.4.6","v1.4.7","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.1","v1.3.0","v1.2.1","v1.2.0","v1.1.0","v1.1.1","v1.0.8-beta","v1.0.7-beta","v1.0.6-beta","v1.0.3-beta","v1.0.2-beta","v1.0.0-beta","v0.0.6-alpha","v0.0.3-alpha","v0.0.2-alpha","v0.0.1-alpha"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-25791.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}