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

🗓️ 21 Jul 2026 20:13:36Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 3 Views

Go crypto/x509 DoS via a certificate with many DNS SAN entries triggering heavy VerifyHostname work.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux10.2aarch64rhc-worker-playbook0.2.10-1.el10_2rhc-worker-playbook-0.2.10-1.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64lerhc-worker-playbook0.2.10-1.el10_2rhc-worker-playbook-0.2.10-1.el10_2.ppc64le.rpm
Red Hat Enterprise Linux10.2s390xrhc-worker-playbook0.2.10-1.el10_2rhc-worker-playbook-0.2.10-1.el10_2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64rhc-worker-playbook0.2.10-1.el10_2rhc-worker-playbook-0.2.10-1.el10_2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64rhc-worker-playbook-debuginfo0.2.10-1.el10_2rhc-worker-playbook-debuginfo-0.2.10-1.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64lerhc-worker-playbook-debuginfo0.2.10-1.el10_2rhc-worker-playbook-debuginfo-0.2.10-1.el10_2.ppc64le.rpm
Red Hat Enterprise Linux10.2s390xrhc-worker-playbook-debuginfo0.2.10-1.el10_2rhc-worker-playbook-debuginfo-0.2.10-1.el10_2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64rhc-worker-playbook-debuginfo0.2.10-1.el10_2rhc-worker-playbook-debuginfo-0.2.10-1.el10_2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64rhc-worker-playbook-debugsource0.2.10-1.el10_2rhc-worker-playbook-debugsource-0.2.10-1.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64lerhc-worker-playbook-debugsource0.2.10-1.el10_2rhc-worker-playbook-debugsource-0.2.10-1.el10_2.ppc64le.rpm
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22 Jul 2026 09:26Current
7.3High risk
Vulners AI Score7.3
CVSS 3.17.5
EPSS0.00939
SSVC
3