CVE-2026-56743

{"id": "CVE-2026-56743", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56743", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-16T13:02:42.889041Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.3}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "cilium", "product": "cilium", "versions": [{"status": "affected", "version": ">= 1.19.0, < 1.19.5"}]}]}], "published": "2026-07-15T20:17:51.987", "references": [{"url": "https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/pull/46305", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/pull/46456", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/releases/tag/v1.19.5", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-863"}]}], "descriptions": [{"lang": "en", "value": "Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5."}], "lastModified": "2026-07-17T17:29:02.113", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0170388B-1CC3-4015-BD0D-CBA127A52679", "versionEndExcluding": "1.19.5", "versionStartIncluding": "1.19.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}