CVE-2026-77692

Unauthenticated remote crash of named via a single DoH SIG(0) request

State: Published
Severity: 7.5 High
Published: Sep 16, 2026
Updated: Sep 17, 2026
Reserved: Aug 21, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	isc

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
BIND 9ISC	9.20.0 through 9.20.27Affected 9.21.0 through 9.21.25Affected 9.20.9-S1 through 9.20.27-S1Affected

References

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

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