High severity · published Sep 16, 2026
CVE-2026-77692
Unauthenticated remote crash of named via a single DoH SIG(0) request
7.5
CVSS
6.6%
EPSS
No
On KEV
Description
An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS request with a cryptographically invalid SIG(0) record, and then closing the transport connection prematurely.
This issue affects 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)6.6% · higher than 94% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
B9
BIND 9 · ISC
9.20.0 through 9.20.27; 9.21.0 through 9.21.25; 9.20.9-S1 through 9.20.27-S1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77692
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77692
downloads.isc.org
https://downloads.isc.org/isc/bind9/9.20.29
downloads.isc.org
https://downloads.isc.org/isc/bind9/9.21.26
kb.isc.org
https://kb.isc.org/docs/cve-2026-77692
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