CVE-2026-59566

HIGHPre-NVD 8.48.4—
EchelonGraph scoreHIGH confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-08-24. a secondary CVSS source baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.4
EG Score
8.4(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic
https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026

Vendor Advisories for CVE-2026-59566(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 27× in last 7d / 101× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-09-19 11:45 UTCGHSA enrichment
  2. 2026-09-18 23:10 UTCEG score recompute
  3. 2026-09-18 23:10 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 10:49 UTCGHSA enrichment
  6. 2026-09-17 22:28 UTCEG score recompute
  7. 2026-09-17 22:28 UTCGHSA enrichment
  8. 2026-09-17 19:31 UTCEPSS rescore
  9. 2026-09-17 10:08 UTCGHSA enrichment
  10. 2026-09-16 21:48 UTCEG score recompute
  11. 2026-09-16 21:47 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 09:27 UTCEG score recompute
  14. 2026-09-16 09:27 UTCGHSA enrichment
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 19:46 UTCGHSA enrichment
  17. 2026-09-15 07:22 UTCEG score recompute
  18. 2026-09-15 07:22 UTCGHSA enrichment
  19. 2026-09-15 03:11 UTCEPSS rescore
  20. 2026-09-14 19:01 UTCGHSA enrichment
  21. 2026-09-14 05:06 UTCEG score recompute
  22. 2026-09-14 05:06 UTCGHSA enrichment
  23. 2026-09-13 16:47 UTCEPSS rescore
  24. 2026-09-13 16:46 UTCGHSA enrichment
  25. 2026-09-13 04:26 UTCGHSA enrichment
Show 75 more
  1. 2026-09-12 16:05 UTCEG score recompute
  2. 2026-09-12 16:05 UTCGHSA enrichment
  3. 2026-09-12 03:45 UTCGHSA enrichment
  4. 2026-09-11 15:24 UTCEG score recompute
  5. 2026-09-11 15:24 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 03:03 UTCGHSA enrichment
  8. 2026-09-10 14:42 UTCEG score recompute
  9. 2026-09-10 14:42 UTCGHSA enrichment
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-10 02:21 UTCGHSA enrichment
  12. 2026-09-09 14:00 UTCGHSA enrichment
  13. 2026-09-09 01:32 UTCEG score recompute
  14. 2026-09-09 01:32 UTCGHSA enrichment
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 03:41 UTCEG score recompute
  17. 2026-09-08 03:41 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-07 15:21 UTCGHSA enrichment
  20. 2026-09-07 02:27 UTCGHSA enrichment
  21. 2026-09-06 13:52 UTCEG score recompute
  22. 2026-09-06 13:52 UTCGHSA enrichment
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-06 01:31 UTCGHSA enrichment
  25. 2026-09-06 01:31 UTCGHSA enrichment
  26. 2026-09-05 13:10 UTCGHSA enrichment
  27. 2026-09-05 00:49 UTCEG score recompute
  28. 2026-09-05 00:49 UTCGHSA enrichment
  29. 2026-09-04 12:28 UTCEG score recompute
  30. 2026-09-04 12:28 UTCGHSA enrichment
  31. 2026-09-04 05:07 UTCEPSS rescore
  32. 2026-09-03 23:59 UTCGHSA enrichment
  33. 2026-09-03 11:16 UTCGHSA enrichment
  34. 2026-09-02 22:55 UTCEG score recompute
  35. 2026-09-02 22:55 UTCGHSA enrichment
  36. 2026-09-02 14:12 UTCEPSS rescore
  37. 2026-09-02 10:29 UTCGHSA enrichment
  38. 2026-09-01 22:00 UTCEG score recompute
  39. 2026-09-01 22:00 UTCGHSA enrichment
  40. 2026-09-01 13:54 UTCEPSS rescore
  41. 2026-09-01 09:40 UTCEG score recompute
  42. 2026-09-01 09:40 UTCGHSA enrichment
  43. 2026-09-01 04:40 UTCEPSS rescore
  44. 2026-08-31 21:16 UTCGHSA enrichment
  45. 2026-08-31 08:56 UTCGHSA enrichment
  46. 2026-08-30 20:32 UTCEG score recompute
  47. 2026-08-30 20:32 UTCGHSA enrichment
  48. 2026-08-30 19:17 UTCEPSS rescore
  49. 2026-08-30 08:12 UTCEG score recompute
  50. 2026-08-30 08:12 UTCGHSA enrichment
  51. 2026-08-30 01:22 UTCEPSS rescore
  52. 2026-08-29 19:51 UTCGHSA enrichment
  53. 2026-08-29 07:31 UTCEG score recompute
  54. 2026-08-29 07:31 UTCGHSA enrichment
  55. 2026-08-28 21:42 UTCEPSS rescore
  56. 2026-08-28 19:09 UTCGHSA enrichment
  57. 2026-08-28 07:25 UTCGHSA enrichment
  58. 2026-08-27 19:05 UTCEG score recompute
  59. 2026-08-27 19:04 UTCGHSA enrichment
  60. 2026-08-27 14:25 UTCEPSS rescore
  61. 2026-08-27 06:41 UTCGHSA enrichment
  62. 2026-08-26 17:51 UTCEG score recompute
  63. 2026-08-26 17:51 UTCGHSA enrichment
  64. 2026-08-26 14:46 UTCEPSS rescore
  65. 2026-08-26 05:29 UTCGHSA enrichment
  66. 2026-08-25 17:07 UTCEG score recompute
  67. 2026-08-25 17:07 UTCGHSA enrichment
  68. 2026-08-25 13:49 UTCEPSS rescore
  69. 2026-08-25 04:45 UTCGHSA enrichment
  70. 2026-08-24 16:25 UTCEG score recompute
  71. 2026-08-24 16:25 UTCGHSA enrichment
  72. 2026-08-24 15:32 UTCEG score recompute
  73. 2026-08-24 15:32 UTCGHSA enrichment
  74. 2026-08-24 14:24 UTCEG score recompute
  75. 2026-08-24 14:02 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-59566?
CVE-2026-59566 is a high vulnerability published on August 24, 2026. 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.
When was CVE-2026-59566 disclosed?
CVE-2026-59566 was first published in the National Vulnerability Database on August 24, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59566 actively exploited?
CVE-2026-59566 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.7% of all scored CVEs.
What is the CVSS score of CVE-2026-59566?
CVE-2026-59566 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-59566?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59566, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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