Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M
CVE-2026-86064Klever-Go: /log controls global node logging
High 8.6
In plain English
A high-severity information exposure in klever-go from klever-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/klever-io/klever-go | 1.7.20 | GHSA-9v8p-frvj-2pcm |
| Go | github.com/klever-io/klever-go | 1.7.20 | GO-2026-6583 |
Affected products (as reported)
Weakness: CWE-200, CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
References
- https://github.com/klever-io/klever-go/security/advisories/GHSA-9v8p-frvj-2pcm x_refsource_CONFIRM
- https://github.com/klever-io/klever-go/pull/74 x_refsource_MISC
- https://github.com/klever-io/klever-go/commit/a2740c985a788fb69e17742ea4f0c37c440733b2 x_refsource_MISC
- https://github.com/klever-io/klever-go/releases/tag/v1.7.20 x_refsource_MISC