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Threatist priority CRITICAL 0 HIGH 0 MEDIUM 1 LOW 1

Signals Exploited in the wild (KEV) 0 Patch available 2 No fix listed 0 Has CVE 2

Fix status Fixed 0 Partial 2 Will not fix 0 Deferred 0 No fix listed 0

Impact type Code execution 0 Privilege escalation 0 Security bypass 0 Information disclosure 0 Tampering 0 Denial of service 0 Spoofing 2 Cross-site scripting 0 SQL injection 0

Attack vector Network 2 Adjacent network 0 Local 0 Physical 0

Requirements No authentication 2 No user interaction 2

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Weakness (CWE) CWE-295 Improper Certificate Validation 2

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Release: Go standard library crypto/x509 1.26.1 × Clear all filters

TI-2026-21588 CVE-2026-27138 · GHSA-ph5j-38mg-j6hp

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

Priority LOW 27

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.

CVSS 3.1MEDIUM 5.9· Network · No auth · No interaction · EPSS 0.00382 · Published 2026-03-06 · Partial fix · 1.26.1 CWE-295

TI-2026-21587 CVE-2026-27137 · GHSA-7hfw-r8qc-89v4

Incorrect enforcement of email constraints in crypto/x509

Priority MEDIUM 40

When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applie…

CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.00661 · Published 2026-03-06 · Partial fix · 1.26.1 CWE-295

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