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.

EPSS: 0.001 (2.3th percentile) — read the EPSS interpretation.

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.

Affected products

Adguard Adguardhome
Adguardteam Adguardhome — versions < 0.107.75

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, 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.