CVE-2026-32936
CVE-2026-32936 · CoreDNS DoH GET path missing size validation causes CPU and memory amplification
Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.
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 · Alta · EPSS 0,7%
- Publicación
- Actualización
Pila tecnológica: network
Productos y versiones afectados
coredns
- Versiones
- < 1.14.3: Afectada
Sin corrección publicada