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TI-2026-42527 Aliases CVE-2026-59565GHSA-c34f-p2fw-3mjr

Local and kernel denial-of-service

Priority MEDIUM 41CWE-229Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00477 41st percentileScored 2026-11-07
Fix Fixed Client Connector (Zscaler): Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ZscalerClient Connectorbefore Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372Patch availableCNA
  • Client Connector VendorZscaler Affected before Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 Fixed in Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:*:*:*——Zscaler
  • cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:*:*:* Versions — — ·Zscaler

Remediation

  • Fix · CNA Client Connector (Zscaler) Fixed in Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59565
  2. 2026-10-03 Alias added: GHSA-c34f-p2fw-3mjr

References

Other 1

  • TI-2023-22133 Inappropriate file type control in Zscaler Proxy versions 3.6.1.25 and prior allows local… CVSS 3.1MEDIUM 5.5
  • TI-2026-42530 Remote code execution in Zscaler Client Connector CVSS 3.1CRITICAL 9.1
  • TI-2026-42526 Authentication bypass between ZCC and client connector portal CVSS 3.1CRITICAL 9.1
  • TI-2020-09334 The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer… CVSS 3.1CRITICAL 9.8
  • TI-2024-15528 Local Privilege Escalation via lack of input validation CVSS 3.1CRITICAL 9.8
  • TI-2025-34691 SAML 2.0 Public Key Validation Issue CVSS 3.1CRITICAL 9.6
See all 58 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences