Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled_CVE-2026-26963

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-02-19T23:38:36.110Z",
    "modified": "2026-02-19T23:38:36.110Z",
    "type": "cve",
    "title": "Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled",
    "source": "GitHub_M",
    "references": "https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3\nhttps://github.com/cilium/cilium/pull/42892\nhttps://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885\nhttps://github.com/cilium/cilium/releases/tag/v1.18.6",
    "id": "CVE-2026-26963",
    "bulletinFamily": "",
    "cwe": [
        "CWE-863"
    ],
    "cvelist": null,
    "sourceData": "cilium cilium >= 1.18.0, < 1.18.6",
    "sourceHref": "",
    "cvss": {
        "score": 6.1,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "cilium",
    "version": ">= 1.18.0, < 1.18.6",
    "vendor": "cilium",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}