CVE-2026-76163 PUBLISHED

named aborts on a TKEY query when the user configuration has no global options statement

Assigner: isc
Reserved: 19.08.2026 Published: 16.09.2026 Updated: 16.09.2026

If BIND is loaded with a "named.conf" file that contains no global "options" block, an attacker can send a query of QTYPE TKEY which may cause an assertion failure and subsequent unexpected program exit. This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	ISC
Product	BIND 9
Versions	Default: unaffected affected from 9.20.0 to 9.20.27 (incl.) affected from 9.21.0 to 9.21.25 (incl.) affected from 9.20.9-S1 to 9.20.27-S1 (incl.)

Exploits

We are not aware of any active exploits.

Workarounds

No workarounds known.

Solutions

Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.29, 9.21.26, or 9.20.29-S1.

Credits

ISC would like to thank Owais Lone (thesecguy) for bringing this vulnerability to our attention.

References

Problem Types

CWE-617 Reachable Assertion CWE

Impacts

BIND may be caused to unexpectedly exit by an attacker resulting in a denial-of-service.