---
id: CVE-2026-86064
title: Klever-Go is the Go implementation of the Klever blockchain protocol
summary: >-
  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…
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L'
cwe:
  - CWE-200
  - CWE-306
vendor: klever-io
product: klever-go
affected:
  - klever-go < 1.7.20
patched:
  - github.com/klever-io/klever-go 1.7.20
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T20:17:20.117'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86064'
references:
  - url: >-
      https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2
    label: security-advisories@github.com
  - url: 'https://github.com/klever-io/klever-go/pull/74'
    label: security-advisories@github.com
  - url: 'https://github.com/klever-io/klever-go/releases/tag/v1.7.20'
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-9v8p-frvj-2pcm'
  - url: 'https://github.com/klever-io/klever-go'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
  - osv
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-23T19:29:16.068653Z'
aliases:
  - GHSA-9v8p-frvj-2pcm
ecosystem: go
ingestedAt: '2026-09-23T19:31:04.479Z'
epss: 0.00397
epssPercentile: 0.31079
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-86064)

Affected packages:

- `github.com/klever-io/klever-go <= 1.7.19`

Patched in:

- `github.com/klever-io/klever-go 1.7.20`

Source: https://github.com/advisories/GHSA-9v8p-frvj-2pcm