CVE-2026-77692: ISC BIND 9

High severity, CVSS 7.5. EPSS: 6.6% chance of exploitation in the next 30 days.

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.

Affected products

• ISC BIND 9: from 9.20.0, up to and including 9.20.27; from 9.21.0, up to and including 9.21.25; from 9.20.9-S1, up to and including 9.20.27-S1

Published 2026-09-16. Last modified 2026-09-17.