Missing Authentication for Critical Function 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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Missing Authentication for Critical Function vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMCOREDNSCOREDNSCOREDNSSERVER-16352718
- published3 May 2026
- disclosed28 Apr 2026
- creditmanizada
Introduced: 28 Apr 2026
CVE-2026-33190 (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 Authentication for Critical Function via the tsig plugin on non-plain-DNS transports. An attacker can gain unauthorized access to restricted DNS data or privileged queries by sending requests over encrypted transports such as DoT, DoH, DoH3, DoQ, or gRPC, bypassing authentication checks.