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

🗓️ 13 Jul 2026 14:29:19Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 4 Views

Golang crypto/x509 VerifyHostname can cause denial of service with certificates having many DNS SAN entries.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10aarch64delve1.26.1-1.module+el8.10.0+24516+40554724delve-1.26.1-1.module+el8.10.0+24516+40554724.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64ledelve1.26.1-1.module+el8.10.0+24516+40554724delve-1.26.1-1.module+el8.10.0+24516+40554724.ppc64le.rpm
Red Hat Enterprise Linux8.10x86_64delve1.26.1-1.module+el8.10.0+24516+40554724delve-1.26.1-1.module+el8.10.0+24516+40554724.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64delve-debuginfo1.26.1-1.module+el8.10.0+24516+40554724delve-debuginfo-1.26.1-1.module+el8.10.0+24516+40554724.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64ledelve-debuginfo1.26.1-1.module+el8.10.0+24516+40554724delve-debuginfo-1.26.1-1.module+el8.10.0+24516+40554724.ppc64le.rpm
Red Hat Enterprise Linux8.10x86_64delve-debuginfo1.26.1-1.module+el8.10.0+24516+40554724delve-debuginfo-1.26.1-1.module+el8.10.0+24516+40554724.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64delve-debugsource1.26.1-1.module+el8.10.0+24516+40554724delve-debugsource-1.26.1-1.module+el8.10.0+24516+40554724.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64ledelve-debugsource1.26.1-1.module+el8.10.0+24516+40554724delve-debugsource-1.26.1-1.module+el8.10.0+24516+40554724.ppc64le.rpm
Red Hat Enterprise Linux8.10x86_64delve-debugsource1.26.1-1.module+el8.10.0+24516+40554724delve-debugsource-1.26.1-1.module+el8.10.0+24516+40554724.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64go-toolset1.26.5-1.module+el8.10.0+24506+6809f2d9go-toolset-1.26.5-1.module+el8.10.0+24506+6809f2d9.aarch64.rpm
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15 Jul 2026 20:41Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.17.5
EPSS0.00939
SSVC
4