CVE-2026-97313

A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resulting in a denial of service. To be vulnerable, the BIND server must allow recursive queries and have at least two RPZ zones configured: one with the default setting of "recursive-only yes", and the other with "recursive-only no". 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, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://downloads.isc.org/isc/bind9/9.20.30
https://downloads.isc.org/isc/bind9/9.21.27
https://kb.isc.org/docs/cve-2026-97313

Configurations

No configuration.

History

26 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Un servidor BIND recursivo que recibe una consulta con recursión deseada (RD=1) seguida de una consulta no recursiva (RD=0) puede terminar con un fallo de aserción, lo que resulta en una denegación de servicio. Para ser vulnerable, el servidor BIND debe permitir consultas recursivas y tener configuradas al menos dos zonas RPZ: una con la configuración predeterminada de ’recursive-only yes’ y la otra con ’recursive-only no’.\n\nEste problema afecta a BIND 9 en las versiones desde la 9.16.0 hasta la 9.18.50 incluida, desde la 9.20.0 hasta la 9.20.29 incluida, desde la 9.21.0 hasta la 9.21.26 incluida, desde la 9.11.3?S1 hasta la 9.18.50?S1 incluida, y desde la 9.20.9?S1 hasta la 9.20.29?S1 incluida.

21 Oct 2026, 13:21

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-21 13:21

Updated : 2026-10-26 21:10

NVD link : CVE-2026-97313

Mitre link : CVE-2026-97313

CVE.ORG link : CVE-2026-97313

JSON object : View

Products Affected

No product.

CWE

CWE-617

Reachable Assertion

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