Releases

CoreDNS v1.14.3 ships full TSIG verification across all transports, multiple Go security CVE fixes, cache prefetch improvements, and a new forward plugin max_age option — a solid operational hardening release.

• securityUpgrade immediately for 13 Go CVE fixes and TSIG transport hardening

  Go 1.26.2 in this build addresses 13 CVEs. Beyond the runtime fixes, TSIG verification gaps in DoH, DoH3, QUIC, and gRPC transports are now closed — if you run any of those transports with TSIG, unauthenticated requests could previously slip through. Upgrade to v1.14.3 and verify your TSIG configurations are still valid after the stricter enforcement.

• breakingDoH oversized GET requests are now rejected — validate your clients

  CoreDNS now rejects oversized dns query parameters in DoH GET requests. Any client sending unusually large DNS-over-HTTPS GET queries will start getting errors. Test your DoH clients against this build in staging before rolling out; most well-behaved clients are unaffected, but custom or non-standard DoH implementations should be checked.

• enhancementUse max_age in the forward plugin to prevent stale upstream connections

  Long-lived upstream connections can silently degrade or get dropped by middleboxes. The new max_age option in the forward plugin lets you set an absolute connection lifetime. If you've seen sporadic upstream timeouts or resolution failures that resolve themselves, configure max_age to force periodic reconnection — start with something like 30s–5m depending on your upstream stability.

CoreDNS v1.14.2 delivers critical security fixes including ACL bypass prevention and stronger loop detection randomness, plus introduces proxy protocol support for preserving client IPs behind load balancers.

• securityUpgrade immediately to fix ACL bypass vulnerability

  This release fixes CVE-2026-26017 where the rewrite plugin could bypass ACL restrictions. Teams using ACL plugin for access control should prioritize this upgrade and verify their rewrite rules aren't inadvertently exposing restricted zones.

• securityUpdate Go runtime for multiple CVE fixes

  The Go 1.26.1 update addresses five CVEs in the runtime. Plan your rollout to ensure you're getting both CoreDNS fixes and the underlying Go security improvements, especially if your CoreDNS instances are internet-facing.

• enhancementDeploy proxyproto plugin for load balancer environments

  If you're running CoreDNS behind load balancers and need real client IP visibility for logging or ACLs, configure the new proxyproto plugin. This is particularly valuable for environments where client IP-based policies or audit trails are required.