What’s Vulnerable › Vulnerabilities

CVE-2026-97313: Specific RPZ configurations and query patterns may result in an unexpected exit

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-26
• Weakness: CWE-617

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.

Affected products

• ISC BIND: from 9.16.0 through 9.18.50; from 9.20.0 through 9.20.29; from 9.21.0 through 9.21.26; from 9.11.3-S1 through 9.18.50-S1; from 9.20.9-S1 through 9.20.29-S1

References

• 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

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