{"id":"CVE-2026-47703","aliases":["GHSA-xgx4-4h9w-53pv","GO-2026-5756"],"url":"https://o3.security/vulnerability/CVE-2026-47703","summary":"AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle","details":"AdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.75, AdGuard Home's client-triggered DoQ forwarding path to a udp:// upstream reduced backend UDP DNS state by producing dns_id=0 or txid=0 and exposed a quoted-port ICMP source-port oracle, weakening DNS response matching for forwarded queries. This issue is fixed in version 0.107.75.","published":"2026-07-15T16:03:17.047Z","modified":"2026-08-12T03:51:28.531009111Z","cvss":null,"epss":{"score":0.00122,"percentile":0.02417,"asOf":"2026-08-20"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/AdguardTeam/AdGuardHome","fixedVersion":"0.107.75"},{"ecosystem":"Go","name":"github.com/AdguardTeam/dnsproxy","fixedVersion":"0.81.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-xgx4-4h9w-53pv"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47703.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47703"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.531009111Z"}}