Vulnerabilities CVE-2026-47703

CVE-2026-47703

Medium

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 6.3
EPSS Score ⓘ: 0.12%

2.4th percentile
CVSS Vector: 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
Confidence: 90%
Published: Jul 15, 2026
Last Modified: Jul 15, 2026

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