CVE-2026-47703: AdGuard Home is a network-wide software for blocking ads and tracking

Q: How do I fix CVE-2026-47703?

adguardhome: upgrade to 0.107.75. Exact commands for each OS are on this page.

Q: Is CVE-2026-47703 being exploited?

CVE-2026-47703 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-47703 affect?

CVE-2026-47703 affects adguardhome. Severity is medium (CVSS 5.3). 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 q

Q: How urgent is CVE-2026-47703?

Priority 29/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-47703 is a medium-severity flaw (CVSS 5.3) affecting adguardhome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-330, CWE-346
Published	2026-07-15
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: adguard

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-15 17:16 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

adguard adguardhome UPGRADE

Affected: < 0.107.75

Fixed in: 0.107.75

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy adguardhome || rpm -q adguardhome || adguardhome --version

2. UPGRADE to 0.107.75 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade adguardhome

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade adguardhome

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47703?

adguardhome: upgrade to 0.107.75. Exact commands for each OS are on this page.

Is CVE-2026-47703 being exploited?

CVE-2026-47703 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47703 affect?

CVE-2026-47703 affects adguardhome. Severity is medium (CVSS 5.3). 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 q

How urgent is CVE-2026-47703?

Priority 29/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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