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High severity · published Mar 6, 2026
CVE-2026-27137
When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions,…
7.5
CVSS
0.6%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GO
GO · Golang
1.26.0 · source: NVD
Affected product
GO
GO
Golang
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27137
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27137
Mailing List
https://go.dev/cl/752182
Issue Tracking
https://go.dev/issue/77952
Release Notes
https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
Vendor Advisory
https://pkg.go.dev/vuln/GO-2026-4599
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:10125
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:10158
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