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crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application

🗓️ 09 Apr 2026 11:00:43Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

Go crypto/x509 validates wildcard DNS SANs case-sensitively, enabling bypass of chain validation.

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ATTACKERKB		CVE-2026-33810
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8 Apr 202601:06
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AlmaLinux		Important: opentelemetry-collector security update
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BDU FSTEC		The vulnerability of the Go programming language’s crypto/x509 package allows attackers to carry out “man-in-the-middle” type attacks.
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CBLMariner		CVE-2026-33810 affecting package golang for versions less than 1.25.9-1
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CBLMariner		CVE-2026-33810 affecting package golang for versions less than 1.26.2-1
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Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Hardened Imagesanyaarch64golang1.261.26.2-1.hum1golang1.26-1.26.2-1.hum1.aarch64.rpm
Red Hat Hardened Imagesanyx86_64golang1.261.26.2-1.hum1golang1.26-1.26.2-1.hum1.x86_64.rpm
Red Hat Hardened Imagesanynoarchgolang1.26-docs1.26.2-1.hum1golang1.26-docs-1.26.2-1.hum1.noarch.rpm

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24 Jul 2026 08:14Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.18.2 - 8.8
EPSS0.0034
SSVC
CWE-1289
go languagecertificate validationdomain name constraints
4