CVE-2026-32136

critical · 9.8

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.

9.8

CVSS

0.7%

EPSS (exploit prob.)

53rd

EPSS percentile

2026-03-11

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-287

Affected products

Vendor	Product	Affected versions
adguard	adguardhome	< 0.107.73

Check a specific version with /api/v1/cve/match.

References

https://github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-5fg6-wrq4-w5gh

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-32136