CVE-2026-27137 PUBLISHED

Incorrect enforcement of email constraints in crypto/x509

Assigner: Go
Reserved: 17.02.2026 Published: 06.03.2026 Updated: 06.03.2026

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 applied, and only the last constraint will be considered.

Product Status

Vendor Go standard library
Product crypto/x509
Versions Default: unaffected
  • affected from 0 to 1.26.1 (excl.)

Credits

  • Jakub Ciolek

References

Problem Types

  • CWE-295: Improper Certificate Validation