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CVE-2026-27137 is a certificate-validation vulnerability in Go's crypto/x509 package. When verifying a certificate chain containing multiple email-address constraints with identical local portions but different domain portions, the verifier considers only the last constraint instead of properly applying all constraints. This can allow a certificate chain that should be rejected under earlier constraints to validate.
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A certificate-chain verification vulnerability in stdlib causes email address constraints sharing the same local portion but different domain portions to be applied incorrectly: only the last constraint is considered. The plugin rates the vulnerability High, with a CVSS v3 base score of 7.5, and recommends updating stdlib and related packages to version 1.26.1 or later.
A vulnerability tracked as CVE-2026-27137 affecting Unity Linux/UOS Server systems. The supplied CVSS v3 vector indicates remotely exploitable, low-complexity, unauthenticated denial of service with high availability impact (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Incorrect enforcement of email constraints in Go's crypto/x509 certificate-validation component.
Incorrect enforcement of email constraints in Go crypto/x509.
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Cross-references every affected SKU, including bundled OEM variants.
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