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CVE-2026-19377

Improper certificate validation in Cato Client tunnel handshake

MEDIUM
6
CVSS Score
Published: October 15, 2026 at 07:02 AM UTC
Updated: October 16, 2026 at 08:04 PM UTC
5 products affected across 2 vendorsCato Client for macOSCato Client for AndroidCato Client for iOS

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Severity
MEDIUM6
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://knowledge.catonetworks.com/docs/security-vulnerability-cve-2026-19377-that-impacts-cato-client-versions

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6MEDIUMCato
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-295

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