Local denial-of-service

published 2026-08-24 2 mo ago modified 2026-10-12 28 d ago also EUVD-2026-64882

cvss: 8.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

A locally exploitable buffer overflow bug can cause a local denial-of-service attack on affected versions of Zscaler Client Connector on Android and ChromeOS.

Patch / fix

fixed in 1

Zscaler Client Connector Android: 4.2, ChromeOS: 4.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-08-24)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.4	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Zscaler Client Connector

Classification

Weakness

CWE-229 Improper Handling of Values

References

help.zscaler.com /zscaler-client-connector/client-connector-app-release-summary-2026

Sources

CVE List CVE-2026-59566
NVD CVE-2026-59566

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary