CVE-2026-27137

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

• NVD record
• https://pkg.go.dev/vuln/GO-2026-4599Advisory
• https://go.dev/cl/752182
• https://go.dev/issue/77952
• https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk