DNS-over-HTTPS Vulnerability in BIND Software by ISC
CVE-2026-77692

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
16 September 2026

Badges

👾 Exploit Exists

What is CVE-2026-77692?

The vulnerability in BIND allows attackers to remotely force the 'named' service to abort by sending specially crafted DNS-over-HTTPS requests. This problem arises when a cryptographically invalid SIG(0) record is included in the request and the connection is closed prematurely. This could potentially disrupt DNS services and compromise server reliability. Users of affected BIND versions should apply patches to secure their systems.

Affected Version(s)

BIND 9 9.20.0 <= 9.20.27

BIND 9 9.21.0 <= 9.21.25

BIND 9 9.20.9-S1 <= 9.20.27-S1

References

https://kb.isc.org/docs/cve-2026-77692
vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.29
patch
https://downloads.isc.org/isc/bind9/9.21.26
patch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention.
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