Internet Systems Consortium (ISC) has released fresh security updates for BIND, the widely used open source DNS server software, resolving 14 vulnerabilities that could lead to denial-of-service (DoS) attacks.
Seven are high-severity flaws that could be exploited to cause an unexpected program exit, memory exhaustion, named termination, and resource exhaustion, causing DoS conditions.
The remotely exploitable bugs are tracked as CVE-2026-80274, CVE-2026-76163, CVE-2026-19666, CVE-2026-81563, CVE-2026-77692, CVE-2026-19667, and CVE-2026-81736.
They can be triggered using mismatched NOQNAME proof, QTYPE TKEY queries, malformed answers from the authoritative server, SVCB/HTTPS AliasMode records, crafted DNS-over-HTTPS (DoH) requests, and negative answers of 65,536 bytes.
CVE-2026-77692 stands out because it can be exploited remotely without authentication to crash named with a single DoH SIG(0) request.
“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,” ISC explains.
The BIND updates also resolve seven medium-severity vulnerabilities that could lead to cache poisoning, increased memory usage of the negative cache, CPU exhaustion and packet loss, arbitrary attacker-supplied data being added to a zone, and DoS attacks.