CVE-2026-77692 BIND 9 - Denial of Service

BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1 contain a denial of service caused by processing a crafted DNS-over-HTTPS request with an invalid SIG(0) record and premature connection closure, letting attackers crash the named service, exploit requires sending crafted DNS-over-HTTPS requests.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
6.56% 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-476

Vendor fix

Update to a version later than 9.20.27, 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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