CVE-2026-26963

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{"affected": [{"affectedData": [{"product": "cilium", "vendor": "cilium", "versions": [{"status": "affected", "version": ">= 1.18.0, < 1.18.6"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*", "matchCriteriaId": "1EB1228F-3E28-4790-A9E0-D6DE184F39D5", "versionEndExcluding": "1.18.6", "versionStartIncluding": "1.18.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6."}, {"lang": "es", "value": "Cilium es una soluci\u00f3n de red, observabilidad y seguridad con un plano de datos basado en eBPF. Las versiones 1.18.0 a la 1.18.5 permitir\u00e1n incorrectamente el tr\u00e1fico desde Pods en otros nodos cuando el Enrutamiento Nativo, WireGuard y el Cifrado de Nodos est\u00e9n habilitados. Este problema ha sido solucionado en la versi\u00f3n 1.18.6."}], "id": "CVE-2026-26963", "lastModified": "2026-06-17T10:26:27.533", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-26963", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-20T15:26:45.815584Z", "version": "2.0.3"}}]}, "published": "2026-02-20T00:16:16.167", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/cilium/cilium/pull/42892"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/cilium/cilium/releases/tag/v1.18.6"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "cilium: Cilium: Information disclosure via incorrect traffic permitting with specific network configurations", "id": "2441217", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2441217"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-266", "details": ["A flaw was found in Cilium. When specific network configurations, including Native Routing, WireGuard, and Node Encryption, are enabled, Cilium incorrectly allows network traffic from Pods on other nodes. This can lead to unauthorized access to network communications and potential information disclosure."], "name": "CVE-2026-26963", "package_state": [{"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Not affected", "package_name": "openshift-sandboxed-containers/osc-monitor-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Not affected", "package_name": "openshift-sandboxed-containers/osc-operator-bundle", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Not affected", "package_name": "openshift-sandboxed-containers/osc-podvm-builder-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Not affected", "package_name": "openshift-sandboxed-containers/osc-podvm-payload-rhel9", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:confidential_compute_attestation:1", "fix_state": "Not affected", "package_name": "openshift-sandboxed-containers/osc-rhel9-operator", "product_name": "Confidential Compute Attestation"}, {"cpe": "cpe:/a:redhat:multicluster_globalhub", "fix_state": "Not affected", "package_name": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9", "product_name": "Multicluster Global Hub"}, {"cpe": "cpe:/a:redhat:network_observ_optr:1", "fix_state": "Not affected", "package_name": "network-observability/network-observability-ebpf-agent-rhel9", "product_name": "Network Observability Operator"}, {"cpe": "cpe:/a:redhat:network_observ_optr:1", "fix_state": "Not affected", "package_name": "network-observability/network-observability-flowlogs-pipeline-rhel9", "product_name": "Network Observability Operator"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Not affected", "package_name": "ocp-tools-4/jenkins-agent-base-rhel8", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Not affected", "package_name": "ocp-tools-4/jenkins-agent-base-rhel9", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Not affected", "package_name": "ocp-tools-4/jenkins-rhel8", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Not affected", "package_name": "ocp-tools-4/jenkins-rhel9", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Not affected", "package_name": "openshift4/ose-jenkins", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Not 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/pilot-rhel8", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:service_mesh:2", "fix_state": "Not affected", "package_name": "openshift-service-mesh/proxyv2-rhel9", "product_name": "OpenShift Service Mesh 2"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Not affected", "package_name": "rhacm2/acm-prometheus-config-reloader-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Not affected", "package_name": "rhacm2/acm-prometheus-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Not affected", "package_name": "rhacm2/prometheus-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Not affected", "package_name": "rhacm2/thanos-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "delve", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "container-tools:rhel8/podman", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "container-tools:rhel8/runc", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "podman", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "runc", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "cri-o", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": 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affected", "package_name": "openshift4/oc-mirror-plugin-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-cluster-node-tuning-rhel9-operator", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-docker-builder-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-hyperkube", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-hyperkube-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-kube-proxy-rhel9", "product_name": "Red Hat OpenShift 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Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-vsphere-csi-driver-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-vsphere-csi-driver-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-vsphere-csi-driver-syncer-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-vsphere-csi-driver-syncer-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "podman", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "runc", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:windows_machine_config", "fix_state": "Not affected", "package_name": "openshift4-wincw/windows-machine-config-operator-bundle", "product_name": "Red Hat OpenShift for Windows Containers"}, {"cpe": "cpe:/a:redhat:windows_machine_config", "fix_state": "Not affected", "package_name": "openshift4-wincw/windows-machine-config-rhel9-operator", "product_name": "Red Hat OpenShift for Windows Containers"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/ocp-virt-validation-checkup-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/passt-network-binding-plugin-cni-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/passt-network-binding-plugin-sidecar-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/sidecar-shim-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-api", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-api-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-artifacts-server", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-artifacts-server-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-controller", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-controller-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-exportproxy", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-exportproxy-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-exportserver", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-exportserver-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-handler", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-handler-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-launcher", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-launcher-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-operator", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-operator-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/virt-synchronization-controller-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/wasp-agent-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "kubevirt", "product_name": "Red Hat OpenShift Virtualization 4"}], "public_date": "2026-02-19T23:38:36Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-26963\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-26963\nhttps://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885\nhttps://github.com/cilium/cilium/pull/42892\nhttps://github.com/cilium/cilium/releases/tag/v1.18.6\nhttps://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.18.0,1.18.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cilium", "source": "cna", "vendor": "cilium"}, "product": "cilium", "vendor": "cilium"}], "analysis": {"en": {"generated_at": "2026-04-17T17:41:26.642016+00:00", "value": {"mitigation_remediation": ["Upgrade Cilium to version 1.18.6 or later, which contains the fix for this issue.", "If a rapid upgrade is not possible, temporarily disable Native Routing, WireGuard, and Node Encryption until the updated version is deployed.", "Restart Cilium agents after applying the new version to ensure the updated dataplane and firewall policies are active."], "summary": {"action": "Apply Patch", "impact": "Faulty Firewall Enforcement"}, "threat_synthesis": {"affected_systems": "Cilium, versions 1.18.0 through 1.18.5, provide a networking and security solution that utilizes an eBPF dataplane. These releases are vulnerable when the native routing, WireGuard and node encryption features are enabled.", "description_and_impact": "This vulnerability causes Cilium to fail to enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled. Pods on different nodes can communicate through the dataplane, bypassing rules that are normally applied on the host, which could expose services or data to unauthorized pods. The weakness is a bypass of authorization checks, identified as CWE\u2011266 and CWE\u2011863.", "risk_and_exploitability": "The vulnerability is scored 6.1 on CVSS, indicating moderate severity, with an EPSS score below 1%, showing a low likelihood of exploitation at this time. It is not listed in the CISA KEV catalog. The most likely attack vector is the cluster network; an attacker who can influence pod placement or configuration could exploit the flaw to create cross\u2011node traffic that should otherwise be blocked."}}}}, "created": "2026-02-20T09:53:17.190378+00:00", "updated": "2026-04-17T17:45:24.348158+00:00", "vendors": ["cilium", "cilium$PRODUCT$cilium"]}