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CVE-2026-27137

Incorrect enforcement of email constraints in crypto/x509

Published: Mar 6, 2026Updated: Aug 6, 2026 Sources: CVE List NVD BDUCWE-295
7.5HIGH
NVD MITRE
EPSS Score
0.6%
Top 54.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-295

Affected Products

Red Hat Inc.
commercial·USaka red hat
CryostatOn-prem
Operating Systems / linux-distro
cert-manager Operator for Red Hat OpenShiftOn-prem
Operating Systems / linux-distro
Custom Metric Autoscaler operator for Red Hat OpenshiftOn-prem
Operating Systems / linux-distro
Assisted Installer for Red Hat OpenShift Container PlatformOn-prem
Operating Systems / linux-distro
Multicluster Global HubOn-prem
Operating Systems / linux-distro
Builds for Red Hat OpenShiftOn-prem
Operating Systems / linux-distro
golang
oss-project·US
go
OSS Libraries
Go standard library
oss-project·USaka golang standard library, net/http, html/template, crypto/x509
crypto/x509LibraryLibrary
OSS Libraries / generic-library
The Go Project
oss-projectaka crypto, go, golang-google-protobuf
Go
OSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://go.dev/cl/752182
go.dev
https://go.dev/issue/77952
go.dev
https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
groups.google.com
and 54 more references View all →

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