CVE-2026-32934
CVE-2026-32934 · CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service
This page contains facts from public vulnerability sources. Check the original advisory before updating.
CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-QUIC (DoQ) server can be driven into unbounded goroutine and memory growth by a remote client that opens many QUIC streams and sends only 1 byte per stream. When the worker pool is full, CoreDNS still spawns a goroutine per accepted stream to wait for a worker token. Additionally, active workers block indefinitely in io.ReadFull() with no per-stream read deadline, allowing an attacker to pin all workers by sending a single byte so the read blocks waiting for the second byte of the DoQ length prefix. This enables an unauthenticated remote attacker to cause memory exhaustion and OOM-kill. This issue has been fixed in version 1.14.3. No known workarounds exist.
CVSS 8.7 · High · EPSS 0.6%
- Published
- Updated
Stack: network
Affected products and versions
coredns
- Versions
- < 1.14.3: Affected
No fix published