What is CVE-2026-47703?

CVE-2026-47703 is a medium-severity vulnerability in Adguard Adguardhome, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2026-07-15.

How severe is CVE-2026-47703?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Adguard Adguardhome

CVE-2026-47703

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.

Published 2026-07-15 · last modified 2026-07-30.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.001 (3.3th percentile), scored 2026-10-21.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Adguard Adguardhome
Adguardteam Adguardhome — versions < 0.107.75

Weakness classification (CWE)

References

github.com/AdguardTeam/AdGuardHome/security/advisories/GHSA-xgx4-4h9w-53pv (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-47703?: CVE-2026-47703 is a medium-severity vulnerability in Adguard Adguardhome, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2026-07-15.
How severe is CVE-2026-47703?: Medium severity. CVSS v3 base score is 5.3 out of 10.