CVE-2026-59565
Remote buffer overflow in Zscaler Windows client can cause local/kernel DoS.
Is CVE-2026-59565 being exploited?
Not confirmed. CVE-2026-59565 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-59565?
CVE-2026-59565 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-59565?
Not known from our data. No patch reference has been recorded for CVE-2026-59565, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-59565 affect?
CVE-2026-59565 affects Zscaler Client Connector (Windows). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-59565?
Apply vendor patch ASAP; restrict exposure and monitor endpoints.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote buffer overflow allows attackers to trigger local and kernel-level denial of service (system/kernel crash or reboot).
Patch when possible
- affected< Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.