CVE-2026-19377
Improper certificate validation in Cato Client tunnel handshake
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.12.6, 6.1.1, 5.8.1, 5.9, 5.6.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Cato Networks Cato Client for Windows
fixed in 6.12.6
- Cato Networks Cato Client for macOS
fixed in 6.1.1
- Cato Networks Cato Client for Linux
fixed in 5.8.1
- Cato Networks Cato Client for iOS
fixed in 5.9
- Cato Networks Cato Client for Android
fixed in 5.6.2