CVE-2026-96888 BIND 9 - Denial of Service

BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1 contain a denial of service caused by assertion failure when processing redirect zones with qname-minimization strict enabled, letting attackers cause resolver crashes, exploit requires specific configuration.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-476

Vendor fix

Update to a version later than 9.21.26 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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