Resource exhaustion in AdGuard Home - #VU137481
Published: July 14, 2026
Vulnerability identifier: #VU137481
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: AdGuard
Affected software:
AdGuard Home
AdGuard Home
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper resource management in the DNS-over-QUIC listener and request-processing budget handling when accepting idle QUIC connections or incomplete DoQ streams. A remote attacker can open idle QUIC connections or send partial DoQ streams to cause a denial of service.
Because the request-processing budget is shared across multiple DNS frontends, exhausting it through the DoQ listener can stall or block unrelated DNS traffic handled by the same server instance.
Remediation
Install security update from vendor's website.