CVE-2026-97313
Specific RPZ configurations and query patterns may result in an unexpected exit
Description
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.
INFO
Published Date :
Oct. 21, 2026, 1:21 p.m.
Last Modified :
Oct. 26, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update BIND server to a patched version.
- Verify RPZ zone configurations.
- Disable recursive queries if possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-97313.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-97313 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-97313
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-97313 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-97313 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Changed Translation Title: BIND 9 de ISC, Description: 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. Title: BIND 9 de ISC, Description: 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. -
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: BIND 9 de ISC, Description: 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. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 21, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-97313', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-21T15:18:26.657640Z'} -
New CVE Received by [email protected]
Oct. 21, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-617 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/97xxx/CVE-2026-97313.json">CVE-2026-97313</a> Added Reference https://downloads.isc.org/isc/bind9/9.20.30 Added Reference https://downloads.isc.org/isc/bind9/9.21.27 Added Reference https://kb.isc.org/docs/cve-2026-97313