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CVE-2026-86064— Klever-Go: /log controls global node logging

Quick assessment

Affected
klever-io klever-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /log WebSocket route configured in config/node/api.yaml and registered by network/api/api.go does not require authentication. The first client message i

CVSS 8.6 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.20 affected
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I. Basic Information for CVE-2026-86064

Vulnerability Information

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Vulnerability Title
Klever-Go: /log controls global node logging
Source: CVE Program / CVE List V5
Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the default-open GET /log WebSocket route configured in config/node/api.yaml and registered by network/api/api.go does not require authentication. The first client message is parsed as a logger Profile in network/api/logs/logSender.go and applied process-wide through Profile.Apply, allowing a remote client to change global log levels and formatting options until the connection closes. The same connection is registered as a log observer and can receive live process logs. An attacker can suppress normal logs, increase verbosity, distort operator visibility, and access operational information without credentials. This issue is fixed in version 1.7.20.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
klever-io klever-go < 1.7.20 -

II. Public POCs for CVE-2026-86064

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III. Intelligence Information for CVE-2026-86064

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Patches & Fixes for CVE-2026-86064 (1)

Other References for CVE-2026-86064 (2)

Same Patch Batch · klever-io · 2026-09-23 · 6 CVEs total

CVE-2026-82405 8.7 HIGH Klever-Go Account takeover: `kleverUpdateAccountPermission` authorizes on attacker-control
CVE-2026-82409 8.4 HIGH Klever-Go: Elasticsearch bulk / painless injection via on-chain account name -> explorer/
CVE-2026-86065 7.5 HIGH Klever-Go: Unauthenticated WebSocket /subscribe: no read-size limit, no connection cap, pe
CVE-2026-82406 7.1 HIGH Klever-Go: Zombie-order theft: `Buy` missing `IsClaimed` guard in native marketplace
CVE-2026-82407 7.0 HIGH Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus livene

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-200

V. Comments for CVE-2026-86064

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