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crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application

🗓️ 19 Aug 2026 19:58:04Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 5 Views

Go crypto/x509 fails to apply excluded DNS constraints to wildcard SANs with mismatched case, allowing certificate validation bypass.

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Red Hat Enterprise Linux10.2s390xyggdrasil0.4.9.2-1.el10_2.2yggdrasil-0.4.9.2-1.el10_2.2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64yggdrasil0.4.9.2-1.el10_2.2yggdrasil-0.4.9.2-1.el10_2.2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64yggdrasil-debuginfo0.4.9.2-1.el10_2.2yggdrasil-debuginfo-0.4.9.2-1.el10_2.2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64leyggdrasil-debuginfo0.4.9.2-1.el10_2.2yggdrasil-debuginfo-0.4.9.2-1.el10_2.2.ppc64le.rpm
Red Hat Enterprise Linux10.2s390xyggdrasil-debuginfo0.4.9.2-1.el10_2.2yggdrasil-debuginfo-0.4.9.2-1.el10_2.2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64yggdrasil-debuginfo0.4.9.2-1.el10_2.2yggdrasil-debuginfo-0.4.9.2-1.el10_2.2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64yggdrasil-debugsource0.4.9.2-1.el10_2.2yggdrasil-debugsource-0.4.9.2-1.el10_2.2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64leyggdrasil-debugsource0.4.9.2-1.el10_2.2yggdrasil-debugsource-0.4.9.2-1.el10_2.2.ppc64le.rpm
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22 Aug 2026 20:19Current
7.5High risk
Vulners AI Score7.5
CVSS 3.18.2 - 8.8
EPSS0.0034
SSVC
CWE-1289
Gocrypto/x509certificate-validationwildcard-sandns-constraintbypassx509
5