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.
- Score
- CVSS 3.1 7.5 High
- Status
- Awaiting Analysis - security-officer@isc.org
- Published
- 2026-10-21
- Last modified
- 2026-10-26
- Weaknesses
- CWE-617
Affected products
References
- https://kb.isc.org/docs/cve-2026-97313
- https://downloads.isc.org/isc/bind9/9.20.30
- https://downloads.isc.org/isc/bind9/9.21.27
