CVE-2026-77692

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductBIND 9

PublishedSep 16, 2026

First seenSep 16, 2026

Weakness typeCWE-476NULL pointer dereference

How to fix

Patches

downloads.isc.org/isc/bind9/9.20.29
downloads.isc.org/isc/bind9/9.21.26

Vendor advisories

kb.isc.org/docs/cve-2026-77692

Affected products

Product	Affected versions	Fixed in
ISC BIND 9	9.20.0 ≤ v ≤ 9.20.27, 9.21.0 ≤ v ≤ 9.21.25, 9.20.9-S1 ≤ v ≤ 9.20.27-S1	—

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