BIND Resolver Vulnerability in ISC Software
CVE-2026-96888

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
21 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-96888?

A BIND resolver misconfiguration involving both a 'redirect' zone and 'qname-minimization strict' can lead to an assertion failure during processing. This flaw affects multiple versions of BIND and requires administrators to review their settings to mitigate the impact. Ensuring the latest patches are applied is critical for maintaining the security and stability of DNS services.

Affected Version(s)

BIND 9 9.16.0 <= 9.18.50

BIND 9 9.20.0 <= 9.20.29

BIND 9 9.21.0 <= 9.21.26

References

https://kb.isc.org/docs/cve-2026-96888
vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.30
patch
https://downloads.isc.org/isc/bind9/9.21.27
patch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention.
.