Renovate: Update module github.com/cert-manager/cert-manager to v1.18.5 [SECURITY]#127
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This PR contains the following updates:
v1.18.2→v1.18.5cert-manager-controller DoS via Specially Crafted DNS Response
BIT-cert-manager-2026-25518 / CVE-2026-25518 / GHSA-gx3x-vq4p-mhhv / GO-2026-4399
More information
Details
Impact
The cert-manager-controller performs DNS lookups during ACME DNS-01 processing (for zone discovery and propagation self-checks). By default, these lookups use standard unencrypted DNS.
An attacker who can intercept and modify DNS traffic from the cert-manager-controller pod can insert a crafted entry into cert-manager's DNS cache. Accessing this entry will trigger a panic, resulting in Denial of Service (DoS) of the cert-manager controller.
The issue can also be exploited if the authoritative DNS server for the domain being validated is controlled by a malicious actor.
Patches
The vulnerability was introduced in cert-manager v1.18.0 and has been patched in cert-manager v1.19.3 and v1.18.5, which are the supported minor releases at the time of publishing.
cert-manager versions prior to v1.18.0 are unaffected.
Workarounds
Resources
Credits
Huge thanks to Oleh Konko (@1seal) for reporting the issue, providing a detailed PoC and an initial patch!
Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
DoS in cert-manager-controller via Specially Crafted DNS Response in github.com/cert-manager/cert-manager
BIT-cert-manager-2026-25518 / CVE-2026-25518 / GHSA-gx3x-vq4p-mhhv / GO-2026-4399
More information
Details
DoS in cert-manager-controller via Specially Crafted DNS Response in github.com/cert-manager/cert-manager
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Release Notes
cert-manager/cert-manager (github.com/cert-manager/cert-manager)
v1.18.5Compare Source
cert-manager is the easiest way to automatically manage certificates in Kubernetes and OpenShift clusters.
This release contains three bug fixes, including a fix for the MODERATE severity DoS issue in GHSA-gx3x-vq4p-mhhv. All users should upgrade to the latest release.
Changes by Kind
Bug or Regression
Other (Cleanup or Flake)
v1.18.4Compare Source
cert-manager is the easiest way to automatically manage certificates in Kubernetes and OpenShift clusters.
We updated Go to fix some vulnerabilities in the standard library.
Changes since
v1.18.3Bug or Regression
CVE-2025-47914andCVE-2025-58181which were reported by Trivy. (#8282, @SgtCoDFish)v1.24.11to fixCVE-2025-61727andCVE-2025-61729(#8295, @wallrj-cyberark)Other (Cleanup or Flake)
golang/x/crypto(#8271, @SgtCoDFish)v1.18.3Compare Source
cert-manager is the easiest way to automatically manage certificates in Kubernetes and OpenShift clusters.
We fixed a bug which caused certificates to be re-issued unexpectedly, if the issuerRef kind or group was changed to one of the "runtime" default values. We increased the size limit when parsing PEM certificate chains to handle leaf certificates with large numbers of DNS named or other identities. We upgraded Go to 1.24.9 to fix various non-critical security vulnerabilities.
Changes since
v1.18.2:Bug or Regression
Other (Cleanup or Flake)
Configuration
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