CVE-2026-32136: Adguard Adguardhome

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

AdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.73, an unauthenticated remote attacker can bypass all authentication in AdGuardHome by sending an HTTP/1.1 request that requests an upgrade to HTTP/2 cleartext (h2c). Once the upgrade is accepted, the resulting HTTP/2 connection is handled by the inner mux, which has no authentication middleware attached. All subsequent HTTP/2 requests on that connection are processed as fully authenticated, regardless of whether any credentials were provided. This vulnerability is fixed in 0.107.73.

Affected products

• Adguard Adguardhome: before 0.107.73 (fixed in 0.107.73)

Published 2026-03-11. Last modified 2026-06-17.