CVE-2026-32934
CVE-2026-32934 · CoreDNS DNS-over-QUIC unbounded goroutine growth leads to denial of service
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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 · Hoch · EPSS 0,5%
- Veröffentlicht
- Aktualisiert
Technologie-Stack: network
Betroffene Produkte und Versionen
coredns
- Softwareversionen
- < 1.14.3: Betroffen
Keine Korrektur veröffentlicht