Threat database

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.

AdGuard Home, when started with the --glinet flag, contains an authentication bypass vulnerability that allows unauthenticated attackers to gain full admin access by supplying a path traversal sequence in the Admin-Token cookie, exploiting unsanitized string concatenation in the token file path construction within the authglinet middleware. Attackers can craft a request with a traversal payload in the Admin-Token header to redirect file reads to arbitrary paths.

CVE-2026-32136 is a critical authentication bypass vulnerability in AdGuard Home versions prior to 0.107.73. An unauthenticated remote attacker can exploit this flaw by sending an HTTP/1.1 request that upgrades the connection to HTTP/2 cleartext (h2c). The upgraded HTTP/2 connection bypasses the authentication middleware, allowing the attacker to perform any actions as if fully authenticated. This vulnerability affects confidentiality, integrity, and availability of the affected systems. The flaw is fixed in version 0.107.73.