CVE-2026-27137 — HIGH (7.5)

Vulnerability Description

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 Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Golang	Go	1.26.0

Related Weaknesses (CWE)

CWE-295

References

https://go.dev/cl/752182Mailing List
https://go.dev/issue/77952Issue Tracking
https://groups.google.com/g/golang-announce/c/EdhZqrQ98hkRelease Notes
https://pkg.go.dev/vuln/GO-2026-4599Vendor Advisory

FAQ

What is CVE-2026-27137?

CVE-2026-27137 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 no...

How severe is CVE-2026-27137?

CVE-2026-27137 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-27137?

Check the references section above for vendor advisories and patch information. Affected products include: Golang Go.