Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
Summary
| CVE | CVE-2026-33810 |
|---|---|
| State | PUBLISHED |
| Assigner | Go |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-08 02:16:03 UTC |
| Updated | 2026-07-09 13:16:59 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 8.2 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS: 0.003400000 probability, percentile 0.260780000 (date 2026-07-12)
Problem Types: CWE-295 | CWE-1289 | CWE-295: Improper Certificate Validation | CWE-1289 Improper Validation of Unsafe Equivalence in Input
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
| 3.1 | ADP | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | ADP | CVSS | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:7291 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| pkg.go.dev/vuln/GO-2026-4866 | [email protected] | pkg.go.dev | Vendor Advisory |
| access.redhat.com/errata/RHSA-2026:19719 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:28047 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:9385 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22862 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:26568 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:26585 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22960 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36651 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/04/20/1 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| access.redhat.com/errata/RHSA-2026:29854 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10155 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19144 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:21769 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10158 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19720 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:14391 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:25089 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/04/19/4 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| access.redhat.com/errata/RHSA-2026:22962 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22959 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:24478 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-33810 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:23345 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19353 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22958 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19135 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:34365 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22347 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19721 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22961 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:21772 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22485 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36796 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| groups.google.com/g/golang-announce/c/0uYbvbPZRWU | [email protected] | groups.google.com | Mailing List, Release Notes |
| access.redhat.com/errata/RHSA-2026:13545 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| go.dev/issue/78332 | [email protected] | go.dev | Issue Tracking |
| access.redhat.com/errata/RHSA-2026:26571 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| go.dev/cl/763763 | [email protected] | go.dev | Patch |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33810.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Riyas from Saintgits College of Engineering (en)
CNA: k1rnt (en)
CNA: @1seal (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-04-08T02:01:09.100Z | Reported to Red Hat. |
| ADP | 2026-04-08T01:06:56.546Z | Made public. |
Solutions
ADP: RHSA-2026:14391: Cryostat 4 on RHEL 9
ADP: RHSA-2026:36796: RHEM 1.0 for RHEL 9
ADP: RHSA-2026:28047: Red Hat OpenStack Platform 17.1
ADP: RHSA-2026:34365: Red Hat Satellite 6.19 for RHEL 9
ADP: RHSA-2026:19719: Red Hat Enterprise Linux AppStream EUS (v. 10.0)
ADP: RHSA-2026:19144: Red Hat Enterprise Linux AppStream (v. 10)
ADP: RHSA-2026:19135: Red Hat Enterprise Linux AppStream (v. 10)
ADP: RHSA-2026:19721: Red Hat Enterprise Linux AppStream EUS (v.9.4)
ADP: RHSA-2026:19720: Red Hat Enterprise Linux AppStream EUS (v.9.6)
ADP: RHSA-2026:19353: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:25089: HawtIO HawtIO 4.4.0
ADP: RHSA-2026:26585: Logging Subsystem for Red Hat OpenShift 6.0
ADP: RHSA-2026:22862: Logging Subsystem for Red Hat OpenShift 6.4
ADP: RHSA-2026:22347: Multicluster Global Hub 1.4.5
ADP: RHSA-2026:21769: Multicluster Global Hub 1.5.4
ADP: RHSA-2026:23345: Multicluster Global Hub 1.6.2
ADP: RHSA-2026:29854: OpenShift API for Data Protection 1.4
ADP: RHSA-2026:26568: OpenShift API for Data Protection 1.5
ADP: RHSA-2026:26571: OpenShift Compliance Operator 1
ADP: RHSA-2026:13545: Red Hat Ansible Automation Platform 2.6
ADP: RHSA-2026:36651: Red Hat Edge Manager 1.0
ADP: RHSA-2026:7291: Red Hat Hardened Images
ADP: RHSA-2026:22485: Red Hat Lightspeed (formerly Insights) for Runtimes 1
ADP: RHSA-2026:10155: Red Hat OpenShift Builds 1.6.5
ADP: RHSA-2026:10158: Red Hat OpenShift Builds 1.7.4
ADP: RHSA-2026:21772: Red Hat OpenShift Dev Spaces 3.28
ADP: RHSA-2026:9385: Red Hat OpenShift distributed tracing 3.9.3
ADP: RHSA-2026:24478: Red Hat Trusted Artifact Signer 1.3
ADP: RHSA-2026:22960: Red Hat Web Terminal 1.11
ADP: RHSA-2026:22958: Red Hat Web Terminal 1.12
ADP: RHSA-2026:22962: Red Hat Web Terminal 1.13
ADP: RHSA-2026:22959: Red Hat Web Terminal 1.14
ADP: RHSA-2026:22961: Red Hat Web Terminal 1.15