CVE-2026-32936
CVE-2026-32936 · CoreDNS DoH GET path missing size validation causes CPU and memory amplification
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CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the DNS-over-HTTPS (DoH) GET path accepts oversized dns= query parameter values and performs URL query parsing, base64 decoding, and DNS message unpacking before rejecting the request. Unlike the POST path, which applies a bounded read via http.MaxBytesReader limited to 65536 bytes, the GET path has no equivalent size validation before expensive processing. A remote, unauthenticated attacker can repeatedly send oversized DoH GET requests to force high CPU usage, large transient memory allocations, and elevated garbage-collection pressure, leading to denial of service. This issue has been fixed in version 1.14.3.
CVSS 8.7 · Hoch · EPSS 0,7%
- Veröffentlicht
- Aktualisiert
Technologie-Stack: network
Betroffene Produkte und Versionen
coredns
- Softwareversionen
- < 1.14.3: Betroffen
Keine Korrektur veröffentlicht