CVE-2026-19667 BIND 9 - Denial of Service

BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1 contain a denial of service caused by a flaw in handling negative cache entries from attacker-controlled authoritative servers producing 65536 byte negative answers, letting remote attackers cause named to abort, exploit requires attacker-controlled authoritative DNS server.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.57% chance of exploitation in 30 days
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
16 September 2026
Updated
15 October 2026
Weakness
CWE-197

Vendor fix

Update to the latest BIND 9 version beyond 9.21.25 or 9.20.27-S1.

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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