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TI-2026-35206 Aliases CVE-2026-47703GHSA-xgx4-4h9w-53pv

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

Priority LOW 27CWE-330Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-346.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00143 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed AdGuardHome (AdguardTeam): 0.107.75github.com/AdguardTeam/AdGuardHome (Go): 0.107.75+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AdguardTeamAdGuardHomebefore 0.107.750.107.75Patch availableCNA
—github.com/AdguardTeam/AdGuardHome (Go)before 0.107.750.107.75Patch availableGHSA-xgx4-4h9w-53pv
—github.com/AdguardTeam/dnsproxy (Go)before 0.81.30.81.3Patch availableGHSA-xgx4-4h9w-53pv
  • AdGuardHome VendorAdguardTeam Affected before 0.107.75 Fixed in 0.107.75 Patch available CNA
  • github.com/AdguardTeam/AdGuardHome (Go) Vendor— Affected before 0.107.75 Fixed in 0.107.75 Patch available GHSA-xgx4-4h9w-53pv
  • github.com/AdguardTeam/dnsproxy (Go) Vendor— Affected before 0.81.3 Fixed in 0.81.3 Patch available GHSA-xgx4-4h9w-53pv

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:adguard:adguardhome:*:*:*:*:*:*:*:*before 0.107.75VulnerableAdguard
  • cpe:2.3:a:adguard:adguardhome:*:*:*:*:*:*:*:* Versions before 0.107.75 Vulnerable ·Adguard

Remediation

  • Fix · CNA AdGuardHome (AdguardTeam) Fixed in 0.107.75
  • Fix · GHSA-xgx4-4h9w-53pv github.com/AdguardTeam/AdGuardHome (Go) Fixed in 0.107.75 Advisory →
  • Fix · GHSA-xgx4-4h9w-53pv github.com/AdguardTeam/dnsproxy (Go) Fixed in 0.81.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47703
  2. 2026-10-03 Alias added: GHSA-xgx4-4h9w-53pv

References

Exploit 1

Advisory 1

Other 3

  • TI-2026-30037 AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie CVSS 4.0CRITICAL 9.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences