CVE-2026-32136: 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…

PriorityP272critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

0.73%

49.8th percentile

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

3 ranges

Vendor	Product	Version range	Fixed in
adguard	adguardhome	< 0.107.73	0.107.73
adguardteam	adguardhome	< 0.107.73	0.107.73
github.com	adguardteam_adguardhome	>= 0 < 0.107.73	0.107.73

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