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golang: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs

🗓️ 10 Apr 2026 14:24:10Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 18 Views

Go x509 flaw allows bypass via an excluded subdomain constraint not restricting wildcard subject alternative

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Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Hardened Imagesanyaarch64golang1.251.25.9-1.hum1golang1.25-1.25.9-1.hum1.aarch64.rpm
Red Hat Hardened Imagesanyx86_64golang1.251.25.9-1.hum1golang1.25-1.25.9-1.hum1.x86_64.rpm
Red Hat Hardened Imagesanynoarchgolang1.25-docs1.25.9-1.hum1golang1.25-docs-1.25.9-1.hum1.noarch.rpm

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05 Oct 2026 04:16Current
6.9Medium risk
Vulners AI Score6.9
CVSS 3.16.5
EPSS0.00284
SSVC
CWE-295
go language securitycertificate bypasswildcard subject alternativesubdomain constraint
18