CVE-2026-31837

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Esta vulnerabilidad est\u00e1 corregida en 1.29.1, 1.28.5 y 1.27.8."}], "id": "CVE-2026-31837", "lastModified": "2026-07-20T12:18:28.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31837", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-11T15:53:25.811841Z", "version": "2.0.3"}}]}, "published": "2026-03-10T22:16:21.720", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:10184"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:5948"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:5950"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:5952"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-31837"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2446344"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31837.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-1392"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "istio: Istio: Information disclosure and authentication bypass via JWKS resolver unavailability", "id": "2446344", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2446344"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-1392", "details": ["A flaw was found in Istio. A user of Istio could be impacted if the JSON Web Key Set (JWKS) resolver becomes unavailable or fails to fetch keys. This vulnerability can lead to the exposure of hardcoded default settings, potentially bypassing authentication mechanisms and allowing unauthorized access."], "name": "CVE-2026-31837", "package_state": [{"cpe": "cpe:/a:redhat:cert_manager:1", "fix_state": "Affected", "package_name": "cert-manager/cert-manager-istio-csr-rhel9", "product_name": "cert-manager Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:cert_manager:1", "fix_state": "Affected", "package_name": "cert-manager/cert-manager-operator-bundle", "product_name": "cert-manager Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:cert_manager:1", "fix_state": "Affected", "package_name": "cert-manager/cert-manager-operator-rhel9", "product_name": "cert-manager Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:cert_manager:1", "fix_state": "Affected", "package_name": "cert-manager/jetstack-cert-manager-acmesolver-rhel9", "product_name": "cert-manager Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:cert_manager:1", "fix_state": "Affected", "package_name": "cert-manager/jetstack-cert-manager-rhel9", "product_name": "cert-manager Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:ext_dns_optr:1", "fix_state": "Not affected", "package_name": "edo/external-dns-rhel8", "product_name": "ExternalDNS Operator"}, {"cpe": "cpe:/a:redhat:ext_dns_optr:1", "fix_state": "Not affected", "package_name": "edo/external-dns-rhel9", "product_name": "ExternalDNS Operator"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "package_name": "openshift-serverless-1/kn-eventing-istio-controller-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "package_name": "openshift-serverless-1/net-istio-controller-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "package_name": "openshift-serverless-1/net-istio-webhook-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "package_name": "openshift-serverless-1/serverless-kn-operator-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Affected", "package_name": "openshift-serverless-1/serverless-openshift-kn-rhel9-operator", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Affected", "package_name": "openshift-service-mesh/istio-cni-rhel8", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Not affected", "package_name": "openshift-service-mesh/kiali-rhel8", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Affected", "package_name": "openshift-service-mesh/pilot-rhel8", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Affected", "package_name": "openshift-service-mesh/proxyv2-rhel9", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Affected", "package_name": "openshift-service-mesh/istio-cni-rhel9", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Affected", "package_name": "openshift-service-mesh/istio-pilot-rhel9", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Affected", "package_name": "openshift-service-mesh/istio-proxyv2-rhel9", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Affected", "package_name": "openshift-service-mesh/istio-rhel9-operator", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Not affected", "package_name": "openshift-service-mesh/kiali-operator-bundle", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Not affected", "package_name": "openshift-service-mesh/kiali-rhel9", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Not affected", "package_name": "openshift-service-mesh/kiali-rhel9-operator", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "automation-gateway-proxy", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "automation-gateway-proxy-openssl30", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "automation-gateway-proxy-openssl32", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:connectivity_link:1", "fix_state": "Not affected", "package_name": "rhcl-1/rhcl-operator-bundle", "product_name": "Red Hat Connectivity Link 1"}, {"cpe": "cpe:/a:redhat:connectivity_link:1", "fix_state": "Not affected", "package_name": "rhcl-1/rhcl-rhel9-operator", "product_name": "Red Hat Connectivity Link 1"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-kf-notebook-controller-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-kserve-agent-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-kserve-controller-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-kserve-router-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-model-controller-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-model-controller-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-model-registry-operator-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-model-registry-operator-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-model-registry-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-notebook-controller-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-03-10T21:57:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31837\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31837\nhttps://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.29.0-alpha.0,1.29.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.28.0-alpha.0,1.28.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.27.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "istio", "source": "cna", "vendor": "istio"}, "product": "istio", "vendor": "istio"}], "analysis": {"en": {"generated_at": "2026-04-16T03:04:21.063230+00:00", "value": {"mitigation_remediation": ["Upgrade Istio to version 1.29.1, 1.28.5, or 1.27.8, or any newer release that contains the fix.", "Verify that the JWKS endpoint for your identity provider is reachable and returning valid keys; validate that the fallback mechanism does not expose sensitive data.", "Implement monitoring for JWKS fetch failures and enforce strict access controls on the JWKS resolver configuration to limit exposure of default data."], "summary": {"action": "Patch Immediately", "impact": "Credentials Exposure"}, "threat_synthesis": {"affected_systems": "The affected vendor is Istio, the product Istio, and all releases prior to 1.29.1, 1.28.5, and 1.27.8 are impacted. In other words, any Istio 1.28.x series before 1.28.5, any 1.27.x series before 1.27.8, and any 1.29.x series before 1.29.1 are vulnerable. Upgrading to the fixed releases or any newer version resolves the issue.", "description_and_impact": "The Istio service mesh contains a flaw in its JWT Web Key Set (JWKS) resolver. When the resolver is unable to fetch the key set from the configured provider, it falls back to hard\u2011coded default data that includes private key material. An attacker who can trigger a fetch failure and access the fallback output could obtain these private keys, thereby compromising the confidentiality of the service mesh and potentially enabling credential theft or impersonation. This bug is a form of information disclosure (CWE\u2011200) and is exacerbated by the fact that it can occur even when a RequestAuthentication resource is in place.", "risk_and_exploitability": "The CVSS vector scores this vulnerability at 8.7, marking it as high severity. The EPSS score is less than 1\u202f%, indicating that the likelihood of exploitation in the wild is low, and the flaw is not listed in CISA\u2019s Known Exploited Vulnerabilities catalog. However, the potential exposure of hard\u2011coded private keys makes the impact severe enough that it should be mitigated even if the probability is low. The likely attack vector is an environment that can force the JWKS resolver to fail\u2014such as a network partition, misconfigured key provider, or denial\u2011of\u2011service attempt\u2014after which the fallback data can be read by any component involved in processing the authentication flow. Because the flaw is triggered by a failure condition, it is important to confirm that proper error handling and monitoring are in place."}}}}, "created": "2026-03-11T11:39:09.580972+00:00", "updated": "2026-04-16T03:15:22.944319+00:00", "vendors": ["istio", "istio$PRODUCT$istio"]}