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Medium 6.0Published Oct 15, 2026
CVE-2026-19377Improper certificate validation in Cato Client tunnel handshake
Updated under an hour ago ()
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It affects Cato Networks Cato Client for Windows and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.0 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-295
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Cato
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Cato Networks Cato Client for Windows cato_networks:cato_client_for_windows (from the name) | before 6.12.6 | CNA record |
Cato Networks Cato Client for macOS cato_networks:cato_client_for_macos (from the name) | before 6.1.1 | CNA record |
Cato Networks Cato Client for Linux cato_networks:cato_client_for_linux (from the name) | before 5.8.1 | CNA record |
Cato Networks Cato Client for iOS cato_networks:cato_client_for_ios (from the name) | before 5.9 | CNA record |
Cato Networks Cato Client for Android cato_networks:cato_client_for_android (from the name) | before 5.6.2 | CNA record |
References
- https://knowledge.catonetworks.com/docs/security-vulnerability-cve-2026-19377-that-impacts-cato-client-versionsvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.