CVE-2026-86064

HIGH 8.6

Klever-Go: /log controls global node logging

CVSS Score

8.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-200 CWE-306
Vendor	klever-io
Product	klever-go
Published	Sep 23, 2026
Last Updated	Sep 23, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

Low

Affected Versions

klever-io / klever-go

< 1.7.20

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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