CVE-2026-10723 Incorrect acceptance of NSEC3 records
Attackers can forge authenticated NXDOMAIN responses by exploiting incorrect NSEC3 record validation in BIND, potentially misleading DNS clients.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-10723?
CVE-2026-10723 is a medium-severity vulnerability in ISC BIND 9, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Weakness: CWE-347
Which versions are affected by CVE-2026-10723?
How do I fix CVE-2026-10723?
Apply the vendor's patch.
Is CVE-2026-10723 being exploited?
There is no known exploitation of CVE-2026-10723 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-10723, AZL-93120, BELL-CVE-2026-10723, DEBIAN-CVE-2026-10723, ECHO-ed2d-c1b0-5e9e, GHSA-4fw4-hmvf-4www and 4 more.