Assertion Failure Vulnerability in BIND by ISC
CVE-2026-76163

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
16 September 2026

Badges

👾 Exploit Exists

What is CVE-2026-76163?

A vulnerability in BIND allows attackers to trigger an assertion failure if the application is loaded without a global 'options' block within the 'named.conf' file. An attacker may exploit this by sending a TKEY query, which can lead to an unexpected termination of the BIND process. This issue impacts multiple versions of BIND 9, making it critical for users to apply appropriate patches to mitigate potential risks.

Affected Version(s)

BIND 9 9.20.0 <= 9.20.27

BIND 9 9.21.0 <= 9.21.25

BIND 9 9.20.9-S1 <= 9.20.27-S1

References

https://kb.isc.org/docs/cve-2026-76163
vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.29
patch
https://downloads.isc.org/isc/bind9/9.21.26
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 Owais Lone (thesecguy) for bringing this vulnerability to our attention.
.