BIND 9.20.29 Fixes 14 Security Flaws Enabling DNSSEC Bypass and Denial-of-Service Attacks
ISC released BIND 9.20.29 patching 14 flaws, including two DNSSEC validation bypasses enabling cache poisoning and multiple denial-of-service bugs.
Internet Systems Consortium shipped BIND 9.20.29 (and 9.21.26) fixing 14 vulnerabilities affecting recursive and DNSSEC-validating resolvers. Key flaws include CVE-2026-77119 (CVSS 5.9), which lets injected NSEC3 records from sibling zones make forged answers appear validated, and CVE-2026-19941, enabling forged DNSSEC-validated NXDOMAIN responses. DoS issues include CVE-2026-19668 (CVSS 5.3, CPU exhaustion via crafted DS/DNSKEY key tags) and cache bloat bugs CVE-2026-81736 and CVE-2026-81563; CVE-2026-1903 fixes partially unsigned TSIG zone transfers and CVE-2026-78301 fixes out-of-zone record serving. ISC reports no active exploitation and says CVE-2026-19668 and CVE-2026-77119 have no workarounds, so upgrading is the only reliable mitigation.