PatchSiren cyber security CVE debrief
CVE-2026-62290 cert-manager CVE debrief
The CVE-2026-62290 vulnerability affects cert-manager, a tool that adds certificates and certificate issuers as resource types in Kubernetes clusters. The vulnerability allows namespace users to create Challenge resources without admission validation, potentially leading to the misuse of ClusterIssuer DNS credentials. This issue has a high CVSS score of 7.3 and is classified as HIGH severity. Users of cert-manager versions 1.18.0 through 1.19.5 and 1.20.0 through 1.20.2 should review their deployments for potential exposure.
- Vendor
- cert-manager
- Product
- Unknown
- CVSS
- HIGH 7.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-16
- Original CVE updated
- 2026-07-16
- Advisory published
- 2026-07-16
- Advisory updated
- 2026-07-16
Who should care
Users of cert-manager versions 1.18.0 through 1.19.5 and 1.20.0 through 1.20.2 should review their deployments for potential exposure. This includes operators, platform administrators, vulnerability management teams, and security teams who need to assess the impact of this vulnerability on their environments.
Technical summary
The cert-manager vulnerability allows namespace users to create Challenge resources without admission validation, potentially leading to the misuse of ClusterIssuer DNS credentials. This issue affects cert-manager versions 1.18.0 through 1.19.5 and 1.20.0 through 1.20.2. The vulnerability has a high CVSS score of 7.3 and is classified as HIGH severity. The issue can be fixed by applying patches for cert-manager versions 1.19.6 and 1.20.3.
Defensive priority
High priority for cert-manager users to apply patches or mitigations.
Recommended defensive actions
- Review and apply patches for cert-manager versions 1.19.6 and 1.20.3.
- Restrict Challenge resource creation to authorized users.
- Monitor for suspicious Challenge resource creations.
- Review compensating controls for exposed systems while remediation is scheduled and verified.
- Check relevant monitoring, detection, and logs for exposed assets that need extra review.
- Track exceptions, retest remediated assets, and close the item only after evidence is documented.
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
Evidence notes
The evidence for this CVE is based on official CVE and NVD records, as well as source references from GitHub. The vulnerability affects cert-manager versions 1.18.0 through 1.19.5 and 1.20.0 through 1.20.2. The issue allows namespace users to create Challenge resources without admission validation, potentially leading to the misuse of ClusterIssuer DNS credentials. Defenders should verify their deployments for potential exposure and review the official advisory for affected scope, severity, and vendor guidance.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-16T20:16:46.550Z and has not been modified since then.