CVE-2026-19377

{"id": "CVE-2026-19377", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-19377", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T14:22:50.675325Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "2505284f-8ffb-486c-bf60-e19c1097a90b", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.0, "Automatable": "NOT_DEFINED", "attackVector": "ADJACENT", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "2505284f-8ffb-486c-bf60-e19c1097a90b", "affectedData": [{"vendor": "Cato Networks", "product": "Cato Client for Windows", "versions": [{"status": "affected", "version": "0", "lessThan": "6.12.6", "versionType": "custom"}], "platforms": ["Windows"], "defaultStatus": "unaffected"}, {"vendor": "Cato Networks", "product": "Cato Client for macOS", "versions": [{"status": "affected", "version": "0", "lessThan": "6.1.1", "versionType": "custom"}], "platforms": ["macOS"], "defaultStatus": "unaffected"}, {"vendor": "Cato Networks", "product": "Cato Client for Linux", "versions": [{"status": "affected", "version": "0", "lessThan": "5.8.1", "versionType": "custom"}], "platforms": ["Linux"], "defaultStatus": "unaffected"}, {"vendor": "Cato Networks", "product": "Cato Client for iOS", "versions": [{"status": "affected", "version": "0", "lessThan": "5.9", "versionType": "custom"}], "platforms": ["iOS"], "defaultStatus": "unaffected"}, {"vendor": "Cato Networks", "product": "Cato Client for Android", "versions": [{"status": "affected", "version": "0", "lessThan": "5.6.2", "versionType": "custom"}], "platforms": ["Android"], "defaultStatus": "unaffected"}]}], "published": "2026-10-15T07:17:59.143", "references": [{"url": "https://knowledge.catonetworks.com/docs/security-vulnerability-cve-2026-19377-that-impacts-cato-client-versions", "source": "2505284f-8ffb-486c-bf60-e19c1097a90b"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "2505284f-8ffb-486c-bf60-e19c1097a90b", "description": [{"lang": "en", "value": "CWE-295"}]}], "descriptions": [{"lang": "en", "value": "Improper certificate validation in the tunnel handshake in Cato Client allows a man-in-the-middle attacker to impersonate a Cato Point of Presence (PoP) server and intercept or modify tunnel traffic."}], "lastModified": "2026-10-16T20:04:29.760", "sourceIdentifier": "2505284f-8ffb-486c-bf60-e19c1097a90b"}