Bug 2418682 (CVE-2025-66406)

Summary: CVE-2025-66406 github.com/smallstep/certificates: Step CA: Denial of Service via improper SSH certificate revocation authorization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aarif, abuckta, adudiak, aprice, bdettelb, caswilli, cmah, crizzo, dkuc, doconnor, gtanzill, jbuscemi, jdobes, jmitchel, jsamir, jsherril, jvasik, kaycoth, kgaikwad, kshier, mpierce, mstipich, oezr, orabin, pbohmill, rblanco, rexwhite, rochandr, stcannon, sthirugn, teagle, vkrizan, vmugicag, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in Step CA, an online certificate authority. This vulnerability allows a highly privileged attacker to improperly revoke SSH certificates. Such unauthorized revocation can disrupt services, leading to a denial of service for systems configured with the SSHPOP provisioner that rely on these certificates for secure access.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2025-12-03 20:02:09 UTC
Step CA is an online certificate authority for secure, automated certificate management for DevOps. Prior to 0.29.0, there is an improper authorization check for SSH certificate revocation. This affects deployments configured with the SSHPOP provisioner. This vulnerability is fixed in 0.29.0.