High severity · published Aug 24, 2026
CVE-2026-59566
Local denial-of-service
8.4
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Client Connector · Zscaler
before Android: 4.2; before ChromeOS: 4.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59566
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59566
help.zscaler.com
https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026
More from Client Connector
9.8
CVE-2024-23483
Local Privilege Escalation via lack of input validation
9.8
CVE-2024-23459
Multiple Arbitrary Creates/Overwrites by link following
9.8
CVE-2023-28798
Out-of-bounds write to heap in pacparser
9.8
CVE-2024-23480
Insecure MacOS code sign check fallback
9.8
CVE-2023-28805
ZCC on Linux privilege escalation