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

🗓️ 25 Jun 2026 17:32:16Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 3 Views

DoS in crypto/x509 VerifyHostname due to certificates with many DNS SAN entries causing heavy processing.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.8aarch64go-toolset1.26.4-1.el9_8go-toolset-1.26.4-1.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64lego-toolset1.26.4-1.el9_8go-toolset-1.26.4-1.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xgo-toolset1.26.4-1.el9_8go-toolset-1.26.4-1.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64go-toolset1.26.4-1.el9_8go-toolset-1.26.4-1.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64golang1.26.4-1.el9_8golang-1.26.4-1.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64legolang1.26.4-1.el9_8golang-1.26.4-1.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xgolang1.26.4-1.el9_8golang-1.26.4-1.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64golang1.26.4-1.el9_8golang-1.26.4-1.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64golang-bin1.26.4-1.el9_8golang-bin-1.26.4-1.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64legolang-bin1.26.4-1.el9_8golang-bin-1.26.4-1.el9_8.ppc64le.rpm
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19 Jul 2026 09:52Current
7.1High risk
Vulners AI Score7.1
CVSS 3.17.5
EPSS0.00939
SSVC
3