AIKIDO-2026-65018
github.com/coredns/coredns is vulnerable to Uncontrolled Resource Consumption
75
High Risk
This Affects:
github.com/coredns/corednsTL;DR
CoreDNS unpacks DNS messages received on the DNS-over-HTTPS, DNS-over-QUIC, DNS-over-HTTP/3, and gRPC transports before validating the request header section counts. A crafted, heavily compressed request of roughly 65,533 bytes allocates more than 10 MiB while it is unpacked. Sending many such requests concurrently exhausts server memory and denies service to legitimate clients. The fix validates message headers with the default accept function before unpacking on each custom transport.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you serve the DNS-over-HTTPS, DNS-over-QUIC, DNS-over-HTTP/3, or gRPC transports to untrusted clients.
Background info
github.com/coredns/coredns is vulnerable to Uncontrolled Resource Consumption in versions 0.9.9 - 1.14.6.
How to fix this
Upgrade the github.com/coredns/coredns library to the patch version.
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