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crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries

🗓️ 07 Jul 2026 18:15:17Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 9 Views

Denial of service in Go crypto x509 from a certificate with many Domain Name System Subject Alternative Name entries causing hostname verification to stall.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.8aarch64skopeo2:1.22.2-7.el9_8skopeo-2:1.22.2-7.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64leskopeo2:1.22.2-7.el9_8skopeo-2:1.22.2-7.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xskopeo2:1.22.2-7.el9_8skopeo-2:1.22.2-7.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64skopeo2:1.22.2-7.el9_8skopeo-2:1.22.2-7.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64skopeo-debuginfo2:1.22.2-7.el9_8skopeo-debuginfo-2:1.22.2-7.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64leskopeo-debuginfo2:1.22.2-7.el9_8skopeo-debuginfo-2:1.22.2-7.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xskopeo-debuginfo2:1.22.2-7.el9_8skopeo-debuginfo-2:1.22.2-7.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64skopeo-debuginfo2:1.22.2-7.el9_8skopeo-debuginfo-2:1.22.2-7.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64skopeo-debugsource2:1.22.2-7.el9_8skopeo-debugsource-2:1.22.2-7.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64leskopeo-debugsource2:1.22.2-7.el9_8skopeo-debugsource-2:1.22.2-7.el9_8.ppc64le.rpm
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30 Jul 2026 00:12Current
6Medium risk
Vulners AI Score6
CVSS 3.17.5
EPSS0.00591
SSVC
9