{"id":"CVE-2026-25791","aliases":["GHSA-wxrw-gvg8-fqjp","GO-2026-4466"],"url":"https://o3.security/vulnerability/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.","published":"2026-02-09T20:34:31.144Z","modified":"2026-08-05T03:47:20.910973125Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/bishopfox/sliver","fixedVersion":"1.6.12"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:47:20.910973125Z"}}