CVE-2026-47703

AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle

State: Published
Severity: 6.3 Medium
Published: Jul 15, 2026
Updated: Jul 15, 2026
Reserved: May 19, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-330 Use of Insufficiently Random Values
CWE-346 Origin Validation Error

Affected Products

Product	Versions
AdGuardHomeAdguardTeam	< 0.107.75Affected

References

https://github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-xgx4-4h9w-53pv

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