FKIE_CVE-2026-33810

Vulnerability from fkie_nvd - Published: 2026-04-08 02:16 - Updated: 2026-07-09 13:16
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.
References
security@golang.orghttps://go.dev/cl/763763Patch
security@golang.orghttps://go.dev/issue/78332Issue Tracking
security@golang.orghttps://groups.google.com/g/golang-announce/c/0uYbvbPZRWUMailing List, Release Notes
security@golang.orghttps://pkg.go.dev/vuln/GO-2026-4866Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/04/19/4
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/04/20/1
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:10155
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:10158
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:13545
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:14391
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19135
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19144
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19353
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19719
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19720
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:19721
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:21769
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:21772
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22347
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22485
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22862
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22958
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22959
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22960
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22961
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:22962
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:23345
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:24478
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:25089
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26568
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26571
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26585
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:28047
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:29854
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34365
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:36651
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:36796
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:7291
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:9385
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-33810
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2456335
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33810.json
Impacted products
Vendor Product Version
golang go *

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "crypto/x509",
          "product": "crypto/x509",
          "programRoutines": [
            {
              "name": "newDNSConstraints"
            },
            {
              "name": "dnsConstraints.query"
            },
            {
              "name": "Certificate.Verify"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.26.2",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@golang.org"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:/a:redhat:cryostat:4::el9"
          ],
          "defaultStatus": "affected",
          "product": "Cryostat 4 on RHEL 9",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:edge_manager:1.0::el9"
          ],
          "defaultStatus": "affected",
          "product": "RHEM 1.0 for RHEL 9",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openstack:17.1",
            "cpe:/a:redhat:openstack:17.1::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenStack Platform 17.1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:satellite:6.19::el9",
            "cpe:/a:redhat:satellite_capsule:6.19::el9",
            "cpe:/a:redhat:satellite_maintenance:6.19::el9",
            "cpe:/a:redhat:satellite_utils:6.19::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Satellite 6.19 for RHEL 9",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux_eus:10.0"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10.2"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream (v. 10)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:rhel_eus:9.4::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream EUS (v.9.4)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:rhel_eus:9.6::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream EUS (v.9.6)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux:9::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream (v. 9)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:apache_camel_hawtio:4.4::el9"
          ],
          "defaultStatus": "affected",
          "product": "HawtIO HawtIO 4.4.0",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:logging:6.0::el9"
          ],
          "defaultStatus": "affected",
          "product": "Logging Subsystem for Red Hat OpenShift 6.0",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:logging:6.4::el9"
          ],
          "defaultStatus": "affected",
          "product": "Logging Subsystem for Red Hat OpenShift 6.4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:multicluster_globalhub:1.4::el9"
          ],
          "defaultStatus": "affected",
          "product": "Multicluster Global Hub 1.4.5",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:multicluster_globalhub:1.5::el9"
          ],
          "defaultStatus": "affected",
          "product": "Multicluster Global Hub 1.5.4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:multicluster_globalhub:1.6::el9"
          ],
          "defaultStatus": "affected",
          "product": "Multicluster Global Hub 1.6.2",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_api_data_protection:1.4::el9"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift API for Data Protection 1.4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_api_data_protection:1.5::el9"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift API for Data Protection 1.5",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_compliance_operator:1::el9"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift Compliance Operator 1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:ansible_automation_platform:2.6::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Ansible Automation Platform 2.6",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:edge_manager:1.0::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Edge Manager 1.0",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:hummingbird:1"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Hardened Images",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:lightspeed_for_runtimes:1.0::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Lightspeed (formerly Insights) for Runtimes 1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_builds:1.6::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Builds 1.6.5",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_builds:1.7::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Builds 1.7.4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_devspaces:3.28::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Dev Spaces 3.28",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_distributed_tracing:3.9::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift distributed tracing 3.9.3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:trusted_artifact_signer:1.3::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Trusted Artifact Signer 1.3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:webterminal:1.11::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Web Terminal 1.11",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:webterminal:1.12::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Web Terminal 1.12",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:webterminal:1.13::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Web Terminal 1.13",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:webterminal:1.14::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Web Terminal 1.14",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:webterminal:1.15::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Web Terminal 1.15",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:assisted_installer:2"
          ],
          "defaultStatus": "affected",
          "product": "Assisted Installer for Red Hat OpenShift Container Platform 2",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:cert_manager:1"
          ],
          "defaultStatus": "affected",
          "product": "cert-manager Operator for Red Hat OpenShift",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:confidential_compute_attestation:1"
          ],
          "defaultStatus": "affected",
          "product": "Confidential Compute Attestation",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:deployment_validator_operator"
          ],
          "defaultStatus": "affected",
          "product": "Deployment Validation Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:workload_availability_far:0"
          ],
          "defaultStatus": "affected",
          "product": "Fence Agents Remediation Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_file_integrity_operator:1"
          ],
          "defaultStatus": "affected",
          "product": "File Integrity Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:gatekeeper:3"
          ],
          "defaultStatus": "affected",
          "product": "Gatekeeper 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:logging:5"
          ],
          "defaultStatus": "affected",
          "product": "Logging Subsystem for Red Hat OpenShift",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:workload_availability_mdr:0"
          ],
          "defaultStatus": "affected",
          "product": "Machine Deletion Remediation Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:rhmt:1"
          ],
          "defaultStatus": "affected",
          "product": "Migration Toolkit for Containers",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:mirror_registry:1"
          ],
          "defaultStatus": "affected",
          "product": "mirror registry for Red Hat OpenShift",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:multicluster_engine"
          ],
          "defaultStatus": "affected",
          "product": "Multicluster Engine for Kubernetes",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:ocp_tools"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift Developer Tools and Services",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_pipelines:1"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift Pipelines",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:serverless:1"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift Serverless",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:red_hat_3scale_amp:2"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat 3scale API Management Platform 2",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:certifications:9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Certification Program for Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:connectivity_link:1"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Connectivity Link 1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux_ai:3"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AI (RHEL AI) 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_ai"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift AI (RHOAI)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_cluster_manager_cli:1"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Cluster Manager CLI",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift:4"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Container Platform 4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_data_foundation:4"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Openshift Data Foundation 4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:devworkspace"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Dev Workspaces Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_gitops:1"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift GitOps",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_service_on_aws:1"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift on AWS",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:container_native_virtualization:4"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Virtualization 4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openstack:16.2"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenStack Platform 16.2",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openstack:18.0"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenStack Platform 18.0",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:quay:3"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Quay 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:satellite:6"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Satellite 6",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:service_interconnect:2"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Service Interconnect 2",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_security_profiles_operator:1"
          ],
          "defaultStatus": "affected",
          "product": "Security Profiles Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2"
          ],
          "defaultStatus": "unaffected",
          "product": "Custom Metric Autoscaler operator for Red Hat Openshift",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:external_secrets_operator:1"
          ],
          "defaultStatus": "unaffected",
          "product": "External Secrets Operator for Red Hat OpenShift",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:ext_dns_optr:1"
          ],
          "defaultStatus": "unaffected",
          "product": "ExternalDNS Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:lvms:4"
          ],
          "defaultStatus": "unaffected",
          "product": "Logical Volume Manager Storage",
          "vendor": "Red Hat"
        },
        {
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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