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CVE-2026-47703— AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle

Quick assessment

Affected
AdguardTeam AdGuardHome
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AdguardTeam AdGuardHome是AdguardTeam组织开源的阻止 DNS 服务器的全网广告和跟踪器。 AdguardTeam AdGuardHome 0.107.75之前版本存在安全漏洞，该漏洞源于客户触发的DoQ转发路径导致后端UDP DNS状态降低，通过产生dns_id=0或txid=0并暴露引用的端口ICMP源端口信息，削弱了转发查询的DNS响应匹配。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.14% · P3

Possible ATT&CK Techniques 2 AI

T1043 T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
AdguardTeam AdGuardHome < 0.107.75 affected
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I. Basic Information for CVE-2026-47703

Vulnerability Information
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Vulnerability Title
AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
Source: CVE Program / CVE List V5
Vulnerability Title
AdguardTeam AdGuardHome 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AdguardTeam AdGuardHome是AdguardTeam组织开源的阻止 DNS 服务器的全网广告和跟踪器。 AdguardTeam AdGuardHome 0.107.75之前版本存在安全漏洞，该漏洞源于客户触发的DoQ转发路径导致后端UDP DNS状态降低，通过产生dns_id=0或txid=0并暴露引用的端口ICMP源端口信息，削弱了转发查询的DNS响应匹配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AdguardTeam AdGuardHome < 0.107.75 -

II. Public POCs for CVE-2026-47703

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III. Intelligence Information for CVE-2026-47703

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Vendor Advisories for CVE-2026-47703 (1)

IV. Related Vulnerabilities

Same product: AdGuardHome
Same vendor: AdguardTeam
Same weakness: CWE-330

V. Comments for CVE-2026-47703

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