How severe is CVE-2026-59566?

CVE-2026-59566 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-59566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-59566?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-59566 published?

CVE-2026-59566 was published on 2026-08-24 and last updated on 2026-08-28.

CVE-2026-59566

CVE-2026-59566 is a high-severity vulnerability with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-229.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-229
Published: 2026-08-24
Last modified: 2026-08-28

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.

Frequently asked questions

What is CVE-2026-59566?: 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.
How severe is CVE-2026-59566?: CVE-2026-59566 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-59566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-59566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-59566 published?: CVE-2026-59566 was published on 2026-08-24 and last updated on 2026-08-28.

References

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

Other CWE-229 vulnerabilities

CVE-2025-7964 — Critical (CVSS 9.2): After receiving a malformed 802.15.4 MAC Data Request the Zigbee Coordinator sends a ‘network leave’ request to…
CVE-2026-59565 — High (CVSS 8.8): A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions…
CVE-2024-39531 — High (CVSS 7.5): An Improper Handling of Values vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved…
CVE-2022-24412 — High (CVSS 7.5): Dell EMC PowerScale OneFS 8.2.x - 9.3.0.x contain an improper handling of value vulnerability. An unprivileged network…
CVE-2022-22562 — High (CVSS 7.5): Dell PowerScale OneFS, versions 8.2.0-9.3.0, contain a improper handling of missing values exploit. An unauthenticated…
CVE-2026-4736 — High (CVSS 7.3): Improper Handling of Values vulnerability in No-Chicken Echo-Mate…

Browse all CWE-229 vulnerabilities →