CVE-2026-96888

High

Description

A BIND resolver that is configured with both a "redirect" zone and "qname-minimization strict" may abort with an assertion failure while processing the redirect. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.

SeverityHigh

CVSS7.5

Exploit probability40. percentile0.5%

Product

Microsoft Azl3 Bind

PublishedOct 21, 2026

First seenOct 21, 2026

Weakness typeCWE-476NULL pointer dereference CWE-617CWE-617

How to fix

Patches

Vendor advisories

kb.isc.org/docs/cve-2026-96888

Affected products

Product	Affected versions	Fixed in
microsoft azl3_bind_9.20.26-1	No range specified	—
microsoft azl3_bind_9.20.29-1	No range specified	—

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