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Security Advisories

CVE-2026-27138

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-27138

Severity

5.9

Medium

CVSS V3

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Summary

Panic in name constraint checking for malformed certificates in crypto/x509

Description

Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.

References

Affected packages

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