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Fencer Vulns
high 8.8

CVE-2026-33810 json

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

published 2026-04-07 7 mo ago modified 2026-10-14 26 d ago also BIT-golang-2026-33810 , EUVD-2026-20024 , GO-2026-4866

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami golang 1.26.2
  • go stdlib 1.26.2
  • Go standard library crypto/x509 1.26.2
  • Red Hat Cryostat 4 on RHEL 9 4.1.1-7
  • Red Hat Red Hat Enterprise Linux 10 0:0.4.9.2-1.el10_2.2, 0:0.9.27-7.el10_2, 0:0.144.0-2.el10_2, 0:1.0.0-4.el10_2.7, 0:1.0.1-2.el10_2.4, 0:52.1-1.el10_2.2, 0:165.1-3.el10_2.2, 2:1.43.1-5.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:0.2.3-5.el10_0, 0:0.4.7-6.el10_0, 0:0.144.0-2.el10_0, 0:1.26.1-1.el10_0, 0:1.26.5-1.el10_0, 0:2.21.0-2.el10_0.3, 0:3.6.1-2.el10_0.7, 0:5.3.0-1.el10_0, 0:10.2.6-26.el10_0, 0:134.1-12.el10_0, 1:0.3.2-6.el10_0
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020260803064027.ad008a3a
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020260803064027.ad008a3a
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:75-10.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:75-10.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:0.144.0-2.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.26.5-1.el9_2, 0:2.15.0-2.el9_2.1, 0:5.1.1-5.el9_2.2
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:0.144.0-2.el9_4
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.26.5-1.el9_4, 0:2.17.0-2.el9_4.2, 0:5.1.1-9.el9_4, 2:1.14.6-1.el9_4, 2:1.33.15-1.el9_4.1, 4:1.2.9-1.el9_4.2, 4:4.9.4-20.el9_4.3
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:0.144.0-2.el9_6, 0:1.26.5-1.el9_6, 0:5.1.1-15.el9_6, 0:10.2.6-23.el9_6
  • Red Hat Red Hat OpenStack Platform 16.2 0:0.2.1-1.1.el8ost, 0:3.3.23-22.el8ost
  • Red Hat Red Hat OpenStack Platform 17.1 for RHEL 9 0:3.4.26-9.5.el9ost
  • Red Hat Red Hat OpenStack Services on OpenShift 18.0 0:0.1.1-18.0.20260602234716.a95ae05.el9ost
  • Red Hat Red Hat Satellite 6.19 for RHEL 9 0:0.0.3-5.el9sat
  • Red Hat RHEM 1.0 for RHEL 9 0:1.0.3-1.el9em
  • Red Hat RHEM 1.1 for RHEL 10 0:1.1.4-1.el10em
  • Red Hat RHEM 1.1 for RHEL 9 0:1.1.4-1.el9em
  • Red Hat Builds for Red Hat OpenShift 1.6.0 1776847666
  • Red Hat Compliance Operator 1 1781605005
  • Red Hat Logging for Red Hat OpenShift 6 1781192891
  • Red Hat Logging for Red Hat OpenShift 6.2 1784747813
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4 1780051640
  • Red Hat Multicluster Global Hub 1.4.5 1779838819
  • Red Hat Multicluster Global Hub 1.6.5 1780320809
  • Red Hat OpenShift API for Data Protection 1.3 1785180878
  • golang-1.26 Debian 14 1.26.2-1

debian advisories DEBIAN-CVE-2026-33810

  • podman RHEL 10.2 7:5.8.2-9.el10_2
  • podman-tests RHEL 10.2 7:5.8.2-9.el10_2
  • podman-docker RHEL 10.2 7:5.8.2-9.el10_2
  • podman-remote RHEL 10.2 7:5.8.2-9.el10_2
  • flightctl edge manager 1.1 1.1.4-1.el10em
  • flightctl edge manager 1.1 1.1.4-1.el9em
  • flightctl-cli edge manager 1.1 1.1.4-1.el10em
  • flightctl-cli edge manager 1.1 1.1.4-1.el9em

red hat advisories RHSA-2026:76795RHSA-2026:76809RHSA-2026:70201RHSA-2026:69235RHSA-2026:68504RHSA-2026:68334

  • go1.26-openssl SLES for SAP applications 16.0, SLES 16.0 1.26.4-160000.1.1
  • go1.26-openssl SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.26.2-150000.1.6.1
  • go1.26 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.26.2-150000.1.9.1

suse advisories SUSE-SU-2026:22572-1SUSE-SU-2026:1580-1SUSE-SU-2026:1320-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • go1.26-openssl openSUSE Leap 16.0 1.26.4-160000.1.1
  • go1.26 openSUSE Leap 16.0 1.26.2-160000.1.1
  • go1.26 openSUSE Tumbleweed 1.26.2-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21254-1openSUSE-SU-2026:20571-1openSUSE-SU-2026:10525-1

  • podman AlmaLinux 10 7:5.8.2-9.el10_2.alma.1
  • podman-tests AlmaLinux 10 7:5.8.2-9.el10_2.alma.1
  • podman-docker AlmaLinux 10 7:5.8.2-9.el10_2.alma.1
  • podman-remote AlmaLinux 10 7:5.8.2-9.el10_2.alma.1
  • buildah AlmaLinux 10 2:1.43.1-5.el10_2
  • buildah-tests AlmaLinux 10 2:1.43.1-5.el10_2
  • go-fdo-client AlmaLinux 10 1.0.0-4.el10_2.7
  • go-fdo-server AlmaLinux 10 1.0.1-2.el10_2.4

almalinux advisories ALSA-2026:70201ALSA-2026:63332ALSA-2026:62577ALSA-2026:62578ALSA-2026:57126ALSA-2026:19022

  • podman Rocky Linux 10 7:5.8.2-9.el10_2
  • osbuild-composer Rocky Linux 10 165.1-3.el10_2.2.rocky.0.1
  • image-builder Rocky Linux 10 52.1-1.el10_2.2.rocky.0.1
  • buildah Rocky Linux 10 2:1.43.1-5.el10_2
  • go-fdo-client Rocky Linux 10 1.0.0-4.el10_2.7
  • go-fdo-server Rocky Linux 10 1.0.1-2.el10_2.4
  • yggdrasil Rocky Linux 10 0.4.9.2-1.el10_2.2
  • opentelemetry-collector Rocky Linux 10 0.144.0-2.el10_2

rocky linux advisories RLSA-2026:70201RLSA-2026:65895RLSA-2026:65534RLSA-2026:63332RLSA-2026:62577RLSA-2026:62578

  • go Alpine 3.23 1.25.9-r0
  • go Alpine 3.24 1.26.2-r0
  • rclone Alpine 3.24 1.73.5-r0

alpine advisories ALPINE-CVE-2026-33810

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • golang Azure Linux 3.0 1.25.9-1
  • golang Azure Linux 3.0 1.26.2-1

azure linux advisories AZL-82328AZL-82397

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33810 updated cvss 8.8

crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9 Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/jetstack-cert-manager-rhel9
    affected: no fix available
  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9-operator, openshift-sandboxed-containers/osc-monitor-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat Deployment Validation Operator dvo/deployment-validation-rhel8-operator Red Hat Fence Agents Remediation Operator fence-agents-remediation-operator-container
    affected: no fix available
  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9-operator
    affected: no fix planned “Will not fix”
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/eventrouter-rhel9, openshift-logging/logging-loki-rhel9 Red Hat Logical Volume Manager Storage lvms4/topolvm-rhel9 Red Hat mirror registry for Red Hat OpenShift openshift/mirror-registry-rhel8
    affected: no fix available
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/discovery-rhel9, multicluster-engine/assisted-service-9-rhel9
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Node HealthCheck Operator node-healthcheck-operator-container Red Hat OpenShift Developer Tools and Services helm, openshift-jenkins-2-container, ocp-tools-4/jenkins-agent-base-rhel9 Red Hat OpenShift Pipelines openshift-pipelines-client Red Hat OpenShift Serverless kn-workflow-plugin, openshift-serverless-clients, openshift-serverless-1/kn-plugin-event-sender-rhel9
    affected: no fix available
  • Red Hat 3scale API Management Platform 2 3scale-amp26/operator, 3scale-amp26/3scale-operator, 3scale-amp2/3scale-rhel7-operator
    affected: no fix planned “Will not fix”
show 16 more
  • Red Hat Certification Program for Red Hat Enterprise Linux 9 redhat-certification-preflight Red Hat Connectivity Link 1 rhcl-1/coredns-rhel9 Red Hat Enterprise Linux 8 golang, grafana, go-toolset, golang-bin, golang-src, golang-misc, +20 more Red Hat Enterprise Linux 9 runc, podman, skopeo, buildah, grafana, ignition, +20 more
    affected: no fix available
  • Red Hat Enterprise Linux 10 rhc, delve, git-lfs, grafana, ignition, grafana-pcp, +3 more
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 golang Red Hat OpenShift AI (RHOAI) rhoai/odh-ml-pipelines-runtime-generic-rhel9 Red Hat OpenShift Cluster Manager CLI ocm-cli-clients/ocm-cli-rhel9 Red Hat OpenShift Container Platform 4 butane, ignition, ignition-validate, butane-redistributable
    affected: no fix available
  • Red Hat Openshift Data Foundation 4 odf4/cephcsi-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Dev Workspaces Operator devworkspace/devworkspace-rhel9-operator
    affected: no fix available
  • Red Hat OpenShift GitOps openshift-gitops-1/dex-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift on AWS rosa Red Hat OpenStack Platform 16.2 golang-github-infrawatch-apputils Red Hat OpenStack Platform 18.0 rhoso-operators/sg-core-rhel9 Red Hat Satellite 6 satellite/iop-vmaas-rhel9, yggdrasil-worker-forwarder
    affected: no fix available
  • Red Hat Service Interconnect 2 skupper-cli
    affected: no fix available “Fix deferred”
  • Red Hat Trusted Artifact Signer rhtas/ec-rhel9
    affected: no fix available
  • Red Hat Builds for Red Hat OpenShift 1.6.0 openshift-builds 1776847666
    fixed: vendor fix RHSA-2026:10155
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-storage-rhel9 4.1.1-7
    fixed: vendor fix RHSA-2026:14391
  • Red Hat HawtIO HawtIO 4.4.0
    fixed: vendor fix RHSA-2026:25089
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.0 openshift-logging/eventrouter-rhel9 1781192891
    fixed: vendor fix RHSA-2026:26585
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.2 openshift-logging/eventrouter-rhel9 1784747813
    fixed: vendor fix RHSA-2026:47952
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4 openshift-logging/eventrouter-rhel9 1780051640
    fixed: vendor fix RHSA-2026:22862
  • Red Hat Logical Volume Manager Storage 4.16 lvms4/lvms-rhel9-operator 1793203109
    fixed: vendor fix RHSA-2026:92291

47 more fixed, 69 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L
NVD 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L
OSV 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L

Affected packages

ecosystem package affected fixed in
bitnami golang
>=1.26.0-0, <1.26.2
1.26.2
go stdlib
>=1.26.0-0, <1.26.2
1.26.2

Affected products

  • Go standard library crypto/x509
  • Red Hat Cryostat 4 on RHEL 9
  • Red Hat HawtIO HawtIO 4.4.0
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat OpenStack Platform 16.2
  • Red Hat Red Hat OpenStack Platform 17.1 for RHEL 9
  • Red Hat Red Hat OpenStack Services on OpenShift 18.0
  • Red Hat Red Hat Satellite 6.19 for RHEL 9
  • Red Hat RHEM 1.0 for RHEL 9
  • Red Hat RHEM 1.1 for RHEL 10
  • Red Hat RHEM 1.1 for RHEL 9
  • Red Hat Builds for Red Hat OpenShift 1.6.0
  • Red Hat Compliance Operator 1
  • Red Hat Logging for Red Hat OpenShift 6
  • Red Hat Logging for Red Hat OpenShift 6.2
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4
  • Red Hat Multicluster Global Hub 1.4.5
  • Red Hat Multicluster Global Hub 1.6.5
  • Red Hat OpenShift API for Data Protection 1.3
  • Red Hat OpenShift API for Data Protection 1.4
  • Red Hat OpenShift API for Data Protection 1.5
  • Red Hat Red Hat Ansible Automation Platform 2.6
  • Red Hat Red Hat Edge Manager 1.0
  • Red Hat Red Hat Edge Manager 1.1
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Lightspeed (formerly Insights) for Runtimes 1.0
  • Red Hat Red Hat Migration Toolkit 1.8
  • Red Hat Red Hat multicluster global hub 1.5.3
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift Builds 1.7.3
  • Red Hat Red Hat OpenShift Dev Spaces 3.28
  • Red Hat Red Hat OpenShift distributed tracing 3.9.3
  • Red Hat Red Hat Trusted Artifact Signer 1.3
  • Red Hat Red Hat Web Terminal 1.11
  • Red Hat Red Hat Web Terminal 1.12
  • Red Hat Red Hat Web Terminal 1.13
  • Red Hat Red Hat Web Terminal 1.14
  • Red Hat Red Hat Web Terminal 1.15
  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2
  • Red Hat cert-manager Operator for Red Hat OpenShift

Classification

Weakness
  • CWE-1289 Improper Validation of Unsafe Equivalence in Input
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.