CVE-2026-27137
Incorrect enforcement of email constraints in crypto/x509
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.5EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
06 Mar 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Go standard library · crypto/x509Want to know if your infrastructure is exposed to this?
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