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CVE-2026-19377 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://knowledge.catonetworks.com/docs/security-vulnerability-cve-2026-19377-that-impacts-cato-client-versions	Cato	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-295	Improper Certificate Validation	Cato

Affected Products

Product	Versions
Cato Networks Cato Client	< 6.12.6 (semver) < 6.1.1 (semver) < 5.8.1 (semver) < 5.9 < 5.6.2 (semver)
CPE cpe:2.3:a:catonetworks:cato_client:::::::: Remediation Upgrade: 6.12.6moderate efforthttps://knowledge.catonetworks.com/docs/managing-the-rollout-of-client-versions-client-upgrade-policy#h_01jpj9tnq5s5txeye5c86stc7t Upgrade: 6.1.1moderate efforthttps://knowledge.catonetworks.com/docs/managing-the-rollout-of-client-versions-client-upgrade-policy#h_01jpj9tnq5s5txeye5c86stc7t Upgrade: 5.8.1moderate efforthttps://knowledge.catonetworks.com/docs/managing-the-rollout-of-client-versions-client-upgrade-policy#h_01jpj9tnq5s5txeye5c86stc7t Upgrade: 5.9moderate efforthttps://support.apple.com/app-store Upgrade: 5.6.2moderate efforthttps://play.google.com/store/apps

Product

Versions

Cato Networks Cato Client

< 6.12.6 (semver)

< 6.1.1 (semver)

< 5.8.1 (semver)

< 5.9

< 5.6.2 (semver)

CPE

cpe:2.3:a:catonetworks:cato_client:*:*:*:*:*:*:*:*

Remediation

Upgrade: 6.12.6moderate efforthttps://knowledge.catonetworks.com/docs/managing-the-rollout-of-client-versions-client-upgrade-policy#h_01jpj9tnq5s5txeye5c86stc7t
Upgrade: 6.1.1moderate efforthttps://knowledge.catonetworks.com/docs/managing-the-rollout-of-client-versions-client-upgrade-policy#h_01jpj9tnq5s5txeye5c86stc7t
Upgrade: 5.8.1moderate efforthttps://knowledge.catonetworks.com/docs/managing-the-rollout-of-client-versions-client-upgrade-policy#h_01jpj9tnq5s5txeye5c86stc7t
Upgrade: 5.9moderate efforthttps://support.apple.com/app-store
Upgrade: 5.6.2moderate efforthttps://play.google.com/store/apps

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 15, 2026	CVE Modified	CISA-ADP
Oct 15, 2026	New CVE Received	Cato