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CVE-2026-33810

Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509

Published: Apr 8, 2026Updated: Sep 18, 2026 Sources: CVE List NVD BDUCWE-295
8.2HIGH
NVD MITRE
EPSS Score
0.3%
Top 72.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-295CWE-1289

Affected Products

Red Hat Inc.
commercial·USaka red hat
Red Hat Enterprise LinuxOn-premOS
Operating Systems / linux-distro
Red Hat QuayOn-prem
Operating Systems / linux-distro
Red Hat 3scale API Management PlatformOn-prem
Operating Systems / linux-distro
Openshift Service MeshOn-prem
Operating Systems / linux-distro
Red Hat Openshift Data FoundationOn-prem
Operating Systems / linux-distro
Red Hat OpenShift GitOpsOn-prem
Operating Systems / linux-distro
Red Hat OpenShift Container PlatformOn-prem
Operating Systems / linux-distro
Red Hat SatelliteOn-prem
Operating Systems / linux-distro
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
The Go Project
oss-projectaka golang-google-protobuf, go, crypto
Go
OSS Libraries
golang
oss-project·US
go
OSS Libraries
Go standard library
oss-project·USaka html/template, net/http, crypto/x509, golang standard library
crypto/x509LibraryLibrary
OSS Libraries / generic-library
and 51 more affected products View all →

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

http://www.openwall.com/lists/oss-security/2026/04/19/4
openwall.com
https://go.dev/issue/78332
go.dev
https://pkg.go.dev/vuln/GO-2026-4866
pkg.go.dev
and 93 more references View all →

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