Allocation of Resources Without Limits or Throttling Affecting github.com/coredns/coredns/core/dnsserver package, versions <1.12.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMCOREDNSCOREDNSCOREDNSSERVER-10332632
- published8 Jun 2025
- disclosed6 Jun 2025
- creditVille Vesilehto
Introduced: 6 Jun 2025
NewCVE-2025-47950 (opens in a new tab)How to fix?
Upgrade github.com/coredns/coredns/core/dnsserver to version 1.12.2 or higher.
Overview
github.com/coredns/coredns/core/dnsserver is a package that implements all the interfaces from Caddy, so that CoreDNS can be a servertype plugin.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the DNS-over-QUIC (DoQ) server implementation. An attacker can cause uncontrolled memory consumption and potentially crash the system by opening many streams.
Note:
This is only exploitable if quic:// is enabled and no limits are set on the number of concurrent streams or goroutines.
Workaround
This vulnerability can be mitigated by disabling QUIC support by removing or commenting out the quic:// block in the Corefile, using container runtime resource limits to detect and isolate excessive memory usage, and/or monitoring QUIC connection patterns and alerting on anomalies.