All vulnerabilities
CVE-2026-97313

BIND 9: Specific RPZ configurations and query patterns may result in an unexpected exit

ISC BIND 9
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.45%Chance of exploitation activity in the next 30 days, higher than 37% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published21 Oct 2026Updated 21 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 5

  • BIND 9affected: 9.16.0 through 9.18.50CVE List
  • BIND 9affected: 9.20.0 through 9.20.29CVE List
  • BIND 9affected: 9.21.0 through 9.21.26CVE List
  • BIND 9affected: 9.11.3-S1 through 9.18.50-S1CVE List
  • BIND 9affected: 9.20.9-S1 through 9.20.29-S1CVE List

References 3