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

🗓️ 27 Jul 2026 02:37:27Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 5 Views

DoS in Golang cryptocurrency? No. DoS in Golang crypto/x509 VerifyHostname from many DNS SAN entries in a crafted certificate causes performance degradation.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux10.2aarch64go-fdo-client1.0.0-4.el10_2.5go-fdo-client-1.0.0-4.el10_2.5.aarch64.rpm
Red Hat Enterprise Linux10.2x86_64go-fdo-client1.0.0-4.el10_2.5go-fdo-client-1.0.0-4.el10_2.5.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64go-fdo-client-debuginfo1.0.0-4.el10_2.5go-fdo-client-debuginfo-1.0.0-4.el10_2.5.aarch64.rpm
Red Hat Enterprise Linux10.2x86_64go-fdo-client-debuginfo1.0.0-4.el10_2.5go-fdo-client-debuginfo-1.0.0-4.el10_2.5.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64go-fdo-client-debugsource1.0.0-4.el10_2.5go-fdo-client-debugsource-1.0.0-4.el10_2.5.aarch64.rpm
Red Hat Enterprise Linux10.2x86_64go-fdo-client-debugsource1.0.0-4.el10_2.5go-fdo-client-debugsource-1.0.0-4.el10_2.5.x86_64.rpm

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28 Jul 2026 09:42Current
6.8Medium risk
Vulners AI Score6.8
CVSS 3.17.5
EPSS0.00591
SSVC
5