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crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate

🗓️ 19 Mar 2026 07:51:30Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 18 Views

A crafted certificate can cause denial of service in Go via unbounded string concatenation in HostnameError.Error().

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8aarch64containernetworking-plugins1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-1:1.4.0-7.rhaos4.16.el8.aarch64.rpm
Red Hat Enterprise Linux8ppc64lecontainernetworking-plugins1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-1:1.4.0-7.rhaos4.16.el8.ppc64le.rpm
Red Hat Enterprise Linux8s390xcontainernetworking-plugins1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-1:1.4.0-7.rhaos4.16.el8.s390x.rpm
Red Hat Enterprise Linux8x86_64containernetworking-plugins1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-1:1.4.0-7.rhaos4.16.el8.x86_64.rpm
Red Hat Enterprise Linux8aarch64containernetworking-plugins-debuginfo1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-debuginfo-1:1.4.0-7.rhaos4.16.el8.aarch64.rpm
Red Hat Enterprise Linux8ppc64lecontainernetworking-plugins-debuginfo1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-debuginfo-1:1.4.0-7.rhaos4.16.el8.ppc64le.rpm
Red Hat Enterprise Linux8s390xcontainernetworking-plugins-debuginfo1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-debuginfo-1:1.4.0-7.rhaos4.16.el8.s390x.rpm
Red Hat Enterprise Linux8x86_64containernetworking-plugins-debuginfo1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-debuginfo-1:1.4.0-7.rhaos4.16.el8.x86_64.rpm
Red Hat Enterprise Linux8aarch64containernetworking-plugins-debugsource1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-debugsource-1:1.4.0-7.rhaos4.16.el8.aarch64.rpm
Red Hat Enterprise Linux8ppc64lecontainernetworking-plugins-debugsource1:1.4.0-7.rhaos4.16.el8containernetworking-plugins-debugsource-1:1.4.0-7.rhaos4.16.el8.ppc64le.rpm
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10 Sep 2026 08:56Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.17.5
EPSS0.00457
SSVC
18