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CVE-2026-19377 Improper certificate validation in Cato Client tunnel handshake

🗓️ 15 Oct 2026 07:02:10Reported by CatoType 
cvelist
 cvelist
🔗 www.cve.org👁 36 Views

Improper certificate validation in Cato Client tunnel handshake allows MitM to intercept traffic.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-19377
15 Oct 202607:18
–circl
cve
CVE
CVE-2026-19377
15 Oct 202607:02
–cve
euvd
EUVD
EUVD-2026-101881
15 Oct 202607:02
–euvd
nvd
NVD
CVE-2026-19377
15 Oct 202607:17
–nvd
ptsecurity
Positive Technologies
PT-2026-114811
15 Oct 202600:00
–ptsecurity
vulnrichment
Vulnrichment
CVE-2026-19377 Improper certificate validation in Cato Client tunnel handshake
15 Oct 202607:02
–vulnrichment
[
  {
    "vendor": "Cato Networks",
    "product": "Cato Client for Windows",
    "platforms": [
      "Windows"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "6.12.6",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Cato Networks",
    "product": "Cato Client for macOS",
    "platforms": [
      "macOS"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "6.1.1",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Cato Networks",
    "product": "Cato Client for Linux",
    "platforms": [
      "Linux"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "5.8.1",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Cato Networks",
    "product": "Cato Client for iOS",
    "platforms": [
      "iOS"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Cato Networks",
    "product": "Cato Client for Android",
    "platforms": [
      "Android"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "5.6.2",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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