Bug 2445345 (CVE-2026-27137)

Summary: CVE-2026-27137 crypto/x509: Incorrect enforcement of email constraints in crypto/x509
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: bbrownin, fdeutsch, oramraz, smullick, stirabos, thason
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A certificate validation flaw has been discovered in the golang crypto/x509 module. When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2446047    
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Description OSIDB Bzimport 2026-03-06 22:02:01 UTC
When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.