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Back to active CVEs
Medium · CVSS 6.0CVE-2026-19377

Improper certificate validation in Cato Client tunnel handshakeCVE-2026-19377

Answer in brief

CVE-2026-19377 records a Medium severity (CVSS 6.0) vulnerability in Improper certificate validation in Cato Client tunnel handshake. The current sources do not mark it as known exploited. The current feed maps Cato Networks/Cato Client for Android (generic), Cato Networks/Cato Client for iOS (generic), Cato Networks/Cato Client for Linux (generic), Cato Networks/Cato Client for macOS (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2026Updated Oct 15, 2026Source checked Oct 15, 2026First seen by HOL Oct 15, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.0
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Cato Networks/Cato Client for Android (generic), Cato Networks/Cato Client for iOS (generic), Cato Networks/Cato Client for Linux (generic), Cato Networks/Cato Client for macOS (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Cato Networks/Cato Client for Androidgeneric>=0 <5.6.25.6.2
Cato Networks/Cato Client for iOSgeneric>=0 <5.95.9
Cato Networks/Cato Client for Linuxgeneric>=0 <5.8.15.8.1
Cato Networks/Cato Client for macOSgeneric>=0 <6.1.16.1.1
Cato Networks/Cato Client for Windowsgeneric>=0 <6.12.66.12.6

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Cato Networks/Cato Client for Android, Cato Networks/Cato Client for iOS, Cato Networks/Cato Client for Linux.
  2. 2Review the reported fix. Update Cato Networks/Cato Client for Android to 5.6.2; Cato Networks/Cato Client for iOS to 5.9; Cato Networks/Cato Client for Linux to 5.8.1; Cato Networks/Cato Client for macOS to 6.1.1; Cato Networks/Cato Client for Windows to 6.12.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 15, 2026

Sources and claim methodology

  • Source referenceknowledge.catonetworks.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Steve doesn’t verify a server’s certificate and is susceptible to man-in-the-middle (MitM) attacksAlso CWE-295
  • Fleet doesn’t validate a server’s certificate when connecting through SSHAlso CWE-295
  • Rancher users who can create Projects can gain access to arbitrary projectsSame generic ecosystem
  • NULL Pointer Dereference in qsyncsrv.cgiSame generic ecosystem
  • NULL Pointer Dereference in qsyncsrv.cgiSame generic ecosystem
  • Stack-based Buffer Overflow in qsyncsrv.cgiSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-295
Source
CVE List V5
Source checked
Oct 15, 2026
References
1 linked source
Open source record