Bug 2501514 (CVE-2026-62290)

Summary: CVE-2026-62290 cert-manager: cert-manager: Information disclosure via improper validation of Challenge resources
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in cert-manager. A local attacker, with low privileges as a namespace user, could exploit a lack of admission validation when creating Challenge resources. This allows the attacker to bypass DNS01 solver selectors and cause cert-manager to use ClusterIssuer DNS credentials for attacker-selected provider settings and DNS names. The most significant consequence is the disclosure of sensitive information, specifically X-Api-User and X-Api-Key headers for acme-dns.
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Description OSIDB Bzimport 2026-07-16 20:02:06 UTC 
cert-manager adds certificates and certificate issuers as resource types in Kubernetes clusters, and simplifies the process of obtaining, renewing and using those certificates. From 1.18.0 until 1.19.6 and 1.20.3, Challenge resources under acme.cert-manager.io can be created directly by namespace users without admission validation tying the Challenge to an Order, owner reference, or Issuer-selected solver, allowing attacker-controlled Challenge.spec.solver values referencing a ClusterIssuer to bypass DNS01 solver selectors such as dnsZones, dnsNames, and matchLabels and cause cert-manager to use ClusterIssuer DNS credentials for attacker-selected provider settings and DNS names, including disclosure of X-Api-User and X-Api-Key headers for acme-dns. This issue is fixed in versions 1.19.6 and 1.20.3.