Missing Critical Step in Authentication Affecting github.com/coredns/coredns/core/dnsserver package, versions <1.14.3
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMCOREDNSCOREDNSCOREDNSSERVER-16353272
- published3 May 2026
- disclosed28 Apr 2026
- creditwnoelll
Introduced: 28 Apr 2026
CVE-2026-35579 (opens in a new tab)How to fix?
Upgrade github.com/coredns/coredns/core/dnsserver to version 1.14.3 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 Missing Critical Step in Authentication in the TSIG authentication process for gRPC, QUIC, DoH, and DoH3 transports. An attacker can gain unauthorized access to TSIG-protected functionality, such as performing zone transfers or submitting dynamic DNS updates, by sending requests with forged or invalid TSIG records that are incorrectly accepted as authenticated.