CVE-2026-10723

Medium

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.

SeverityMedium

CVSS6.8

Exploit probability—

ProductIsc Bind

PublishedJul 22, 2026

First seenJul 22, 2026

Weakness typeCWE-347CWE-347

How to fix

Patches

downloads.isc.org/isc/bind9/9.20.26
downloads.isc.org/isc/bind9/9.21.24

Vendor advisories

kb.isc.org/docs/cve-2026-10723

Affected products

Product	Affected versions	Fixed in
isc bind	9.11.3 ≤ v ≤ 9.18.50, 9.18.0 ≤ v ≤ 9.18.50, 9.20.0 ≤ v ≤ 9.20.24, 9.20.9 ≤ v ≤ 9.20.24, 9.21.0 ≤ v ≤ 9.21.23	—

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