CVE-2026-10723: Incorrect acceptance of NSEC3 records
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 9.20.26 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 9.21.24 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 9.20.26-S1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-10723?
CVE-2026-10723 has a medium severity rating of 6.8.
How do I fix CVE-2026-10723?
To fix CVE-2026-10723, upgrade to the latest version of BIND that resolves this vulnerability.
What types of records are affected by CVE-2026-10723?
CVE-2026-10723 affects the incorrect acceptance of child-zone NSEC3 records.
What impact can an attacker have with CVE-2026-10723?
An attacker could potentially forge authenticated NXDOMAIN responses, misleading clients about the existence of domains.
Which versions of BIND are affected by CVE-2026-10723?
BIND versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, and others listed in the vulnerability details are affected.