CVE-2026-19377
MEDIUMCVSS 6/10EPSS 0.08%
Last modified
CVE-2026-19377 is a medium-severity vulnerability rated 6/10 on the CVSS scale. 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.. EPSS estimates a 0.08% chance of exploitation in the next 30 days.
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
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Cato Networks | Cato Client for Windows | < 6.12.6 |
| Cato Networks | Cato Client for macOS | < 6.1.1 |
| Cato Networks | Cato Client for Linux | < 5.8.1 |
| Cato Networks | Cato Client for iOS | < 5.9 |
| Cato Networks | Cato Client for Android | < 5.6.2 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-19377?
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.
How severe is CVE-2026-19377?
CVE-2026-19377 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.08% probability of exploitation in the next 30 days.
How do I fix CVE-2026-19377?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-19371A vulnerability was identified in Nikolaibibo claude-comfyui…5.3
- CVE-2026-19372A security flaw has been discovered in Handwriting-OCR handw…5.3
- CVE-2026-19373A weakness has been identified in PhialsBasement KoboldCPP-M…5.3
- CVE-2026-19374A security vulnerability has been detected in adafap api-mcp…7.3
- CVE-2026-19375A vulnerability was detected in dmitriiweb article-scraper-m…6.3
- CVE-2026-19376A vulnerability has been found in Uasoft Badaso 3.0.0-alpha.…7.3
- CVE-2026-19378A vulnerability was found in code-projects Task Management S…4.3
- CVE-2026-19379A vulnerability was determined in EFM ipTIME AX8004M 15.09.0…7.3
- CVE-2026-1938The YayMail – WooCommerce Email Customizer plugin for WordPr…5.3
- CVE-2026-19380A vulnerability was identified in Mullvad wireguard.sys 0.10…2.3
- CVE-2026-19381A security flaw has been discovered in Kingston FURY CTRL RG…7.8
- CVE-2026-19382A weakness has been identified in Almico Speedfan 4.52. This…2.3
Are you affected by CVE-2026-19377?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST