{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-42508", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-04-28T00:21:12.792Z", "datePublished": "2026-05-22T02:31:27.644Z", "dateUpdated": "2026-07-10T12:05:34.449Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-05-22T02:31:27.644Z" }, "title": "Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts", "descriptions": [ { "lang": "en", "value": "Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked." } ], "affected": [ { "vendor": "golang.org/x/crypto", "product": "golang.org/x/crypto/ssh/knownhosts", "collectionURL": "https://pkg.go.dev", "packageName": "golang.org/x/crypto/ssh/knownhosts", "versions": [ { "version": "0", "lessThan": "0.52.0", "status": "affected", "versionType": "semver" } ], "programRoutines": [ { "name": "hostKeyDB.IsRevoked" } ], "defaultStatus": "unaffected" } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "CWE-295: Improper Certificate Validation" } ] } ], "references": [ { "url": "https://go.dev/issue/79568" }, { "url": "https://go.dev/cl/781220" }, { "url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI" }, { "url": "https://pkg.go.dev/vuln/GO-2026-5021" } ] }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": 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"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:openshift_builds:1.7::el9" ], "defaultStatus": "affected", "product": "Red Hat OpenShift Builds 1.7.4", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:openshift_data_foundation:4.22::el9" ], "defaultStatus": "affected", "product": "Red Hat Openshift Data Foundation 4.22", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:trusted_artifact_signer:1.4::el9" ], "defaultStatus": "affected", "product": "Red Hat Trusted Artifact Signer 1.4", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:external_secrets_operator:1" ], "defaultStatus": "affected", "product": "External Secrets Operator 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:openshift_api_data_protection:1" ], "defaultStatus": "affected", "product": "OpenShift API for Data Protection", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:serverless:1" ], "defaultStatus": "affected", "product": "OpenShift Serverless", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:acm:2" ], "defaultStatus": "affected", "product": "Red Hat Advanced Cluster Management for Kubernetes 2", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:ceph_storage:9" ], "defaultStatus": "affected", "product": "Red Hat Ceph Storage 9", "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: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:4" ], "defaultStatus": "affected", "product": "Red Hat OpenShift Container Platform 4", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:openshift_gitops:1" ], "defaultStatus": "affected", "product": "Red Hat OpenShift GitOps", "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:quay:3" ], "defaultStatus": "affected", "product": "Red Hat Quay 3", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:assisted_installer:2" ], "defaultStatus": "unaffected", "product": "Assisted Installer for Red Hat OpenShift Container Platform 2", "vendor": "Red Hat" }, { "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ], "defaultStatus": "unaffected", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:openstack:16.2" ], "defaultStatus": "unaffected", "product": "Red Hat OpenStack Platform 16.2", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:openstack:17.1" ], "defaultStatus": "unaffected", "product": "Red Hat OpenStack Platform 17.1", "vendor": "Red Hat" }, { "cpes": [ "cpe:/a:redhat:openstack:18.0" ], "defaultStatus": "unaffected", "product": "Red Hat OpenStack Platform 18.0", "vendor": "Red Hat" } ], "datePublic": "2026-05-22T02:31:27.644Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in golang.org/x/crypto/ssh/knownhosts. This vulnerability occurs because the system did not correctly check for the revocation status of a SignatureKey belonging to a Certificate Authority (CA). A remote attacker could potentially exploit this by presenting a revoked key, leading to the system accepting it as valid. This could allow an attacker to bypass security checks and potentially gain unauthorized access or spoof legitimate entities." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-295", "description": "Improper Certificate Validation", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-42508" }, { "name": "RHBZ#2480688", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480688" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42508.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:36796" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:37072" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:35833" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:37123" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:36808" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:26547" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:26546" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:36651" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:23262" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:23264" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:36648" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:37387" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:36797" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:36796: RHEM 1.0 for RHEL 9" }, { "lang": "en", "value": "RHSA-2026:37072: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)" }, { "lang": "en", "value": "RHSA-2026:35833: Red Hat Enterprise Linux AppStream (v. 8)" }, { "lang": "en", "value": "RHSA-2026:37123: Red Hat Enterprise Linux AppStream (v. 9)" }, { "lang": "en", "value": "RHSA-2026:36808: DevWorkspace Operator 0.42" }, { "lang": "en", "value": "RHSA-2026:26547: Red Hat Advanced Cluster Security for Kubernetes 4.10" }, { "lang": "en", "value": "RHSA-2026:26546: Red Hat Advanced Cluster Security for Kubernetes 4.9" }, { "lang": "en", "value": "RHSA-2026:36651: Red Hat Edge Manager 1.0" }, { "lang": "en", "value": "RHSA-2026:23262: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:23264: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:36648: Red Hat OpenShift Builds 1.7.4" }, { "lang": "en", "value": "RHSA-2026:37387: Red Hat Openshift Data Foundation 4.22" }, { "lang": "en", "value": "RHSA-2026:36797: Red Hat Trusted Artifact Signer 1.4" } ], "timeline": [ { "lang": "en", "time": "2026-05-22T04:01:49.515Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-05-22T02:31:27.644Z", "value": "Made public." } ], "title": "golang.org/x/crypto/ssh/knownhosts: golang: golang.org/x/crypto/ssh/knownhosts: Revocation bypass via unchecked SignatureKey", "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-10T12:05:34.449Z" } } ] } }