Allocation of Resources Without Limits or Throttling Affecting kubernetes-dns-node-cache package, versions <1.26.7-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.15% (36th percentile)

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  • Snyk IDSNYK-WOLFILATEST-KUBERNETESDNSNODECACHE-15397944
  • published5 Mar 2026
  • disclosed6 Jun 2025

Introduced: 6 Jun 2025

CVE-2025-47950  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Wolfi kubernetes-dns-node-cache to version 1.26.7-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kubernetes-dns-node-cache package and not the kubernetes-dns-node-cache package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

CoreDNS is a DNS server that chains plugins. In versions prior to 1.12.2, a Denial of Service (DoS) vulnerability exists in the CoreDNS DNS-over-QUIC (DoQ) server implementation. The server previously created a new goroutine for every incoming QUIC stream without imposing any limits on the number of concurrent streams or goroutines. A remote, unauthenticated attacker could open a large number of streams, leading to uncontrolled memory consumption and eventually causing an Out Of Memory (OOM) crash — especially in containerized or memory-constrained environments. The patch in version 1.12.2 introduces two key mitigation mechanisms: max_streams, which caps the number of concurrent QUIC streams per connection with a default value of 256; and worker_pool_size, which Introduces a server-wide, bounded worker pool to process incoming streams with a default value of 1024. This eliminates the 1:1 stream-to-goroutine model and ensures that CoreDNS remains resilient under high concurrency. Some workarounds are available for those who are unable to upgrade. Disable QUIC support by removing or commenting out the quic:// block in the Corefile, use container runtime resource limits to detect and isolate excessive memory usage, and/or monitor QUIC connection patterns and alert on anomalies.

CVSS Base Scores

version 3.1