CVE-2026-56742

{"id": "CVE-2026-56742", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56742", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-16T12:56:22.128191Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "HIGH", "confidentialityImpact": "LOW"}, "impactScore": 3.7, "exploitabilityScore": 1.7}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.9, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.3}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "cilium", "product": "cilium", "versions": [{"status": "affected", "version": "< 1.17.17"}, {"status": "affected", "version": ">= 1.18.0, < 1.18.11"}, {"status": "affected", "version": ">= 1.19.0, < 1.19.5"}]}]}], "published": "2026-07-15T20:17:51.850", "references": [{"url": "https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/releases/tag/v1.17.17", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/cilium/cilium/releases/tag/v1.18.11", "tags": ["Release Notes"], "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-w7c2-w76w-5hmj", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5."}], "lastModified": "2026-07-17T17:48:48.260", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "18200066-7BAA-4F9F-BD35-4C0A722FD570", "versionEndExcluding": "1.17.17"}, {"criteria": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "14989CFB-167A-4E33-A767-CFCCB1B90EA0", "versionEndExcluding": "1.18.11", "versionStartIncluding": "1.18.0"}, {"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"}