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CVE-2026-33810

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

Published: Apr 8, 2026Updated: Apr 20, 2026 Sources: CVE List NVD BDUCWE-295
NVD MITRE
8.2CVSSHIGH
EPSS Score
0.3%
Top 82.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

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
Open in CVSS calculator →

Weaknesses

CWE-295

Affected Products

gogolangOSS Libraries
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Red Hat QuayRed Hat Inc.
On-premWeb App
DevTools & CI / artifact-registry
Red Hat 3scale API Management PlatformRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / api-gateway
Openshift Service MeshRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / container-orchestration
golangoss-projectUSOSS Libraries
red hat inc.commercialUSOperating Systemsaka red hat
and 58 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://go.dev/cl/763763
go.dev
https://go.dev/issue/78332
go.dev
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
groups.google.com
and 12 more references View all →

Timeline

Published
Apr 8, 2026
Last Updated
Apr 20, 2026

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