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

🗓️ 15 Jul 2026 12:33:19Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 6 Views

The VerifyHostname function in Go's crypto/x509 can cause a denial of service from DNS SAN entries.

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Red Hat Enterprise Linux9.8aarch64rhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64lerhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xrhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64rhc1:0.2.7-8.el9_8rhc-1:0.2.7-8.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64rhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64lerhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xrhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64rhc-debuginfo1:0.2.7-8.el9_8rhc-debuginfo-1:0.2.7-8.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64rhc-debugsource1:0.2.7-8.el9_8rhc-debugsource-1:0.2.7-8.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64lerhc-debugsource1:0.2.7-8.el9_8rhc-debugsource-1:0.2.7-8.el9_8.ppc64le.rpm
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17 Jul 2026 07:40Current
6.9Medium risk
Vulners AI Score6.9
CVSS 3.17.5
EPSS0.00939
SSVC
6