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Security Advisories

CVE-2026-33810

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-33810

Severity

7.5

High

CVSS V3

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Summary

Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509

Description

When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.

References

Affected packages

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