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CVE-2026-27138

Panic in name constraint checking for malformed certificates in crypto/x509

Published: Mar 6, 2026Updated: Apr 21, 2026 Sources: CVE List NVD BDUCWE-295
5.9MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 72.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-295

Affected Products

Red Hat Inc.
commercial·USaka red hat
Red Hat Enterprise LinuxOn-premOS
Operating Systems / linux-distro
Openshift Service MeshOn-prem
Operating Systems / linux-distro
Red Hat OpenShift Container PlatformOn-prem
Operating Systems / linux-distro
Red Hat OpenShift VirtualizationOn-prem
Operating Systems / linux-distro
Red Hat Enterprise Linux AIOn-prem
Operating Systems / linux-distro
The Go Project
oss-projectaka crypto, golang-google-protobuf, go
Go
OSS Libraries
Go standard library
oss-project·USaka golang standard library, html/template, net/http, crypto/x509
crypto/x509LibraryLibrary
OSS Libraries / generic-library
golang
oss-project·US
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://pkg.go.dev/vuln/GO-2026-4600
pkg.go.dev
https://access.redhat.com/security/cve/cve-2026-27138
access.redhat.com
https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
groups.google.com
and 3 more references View all →

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