Klever-Go: /log controls global node logging

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-86064: 0.58% estimated exploitation activity in the next 30 days; percentile 47.62 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

An unauthenticated client can connect to GET /log, send an arbitrary logger profile as the first WebSocket message, and mutate the node's global logging configuration before receiving live logs from the process. I confirmed this against a local validator built from this repository: an unauthenticated client set the global log level to :NONE, the node accepted the profile, and the node stopped emitting normal slot logs while the WebSocket connection remained open. This is not a duplicate of the published KVM or P2P advisories. It is a management-plane flaw in the public WebSocket logging endpoint. Vulnerability details Affected code - Route exposed by default in config/node/api.yaml - Route registration in network/api/api.go - Unauthenticated upgrade in network/api/api.go - First client message is parsed as a logger profile and applied globally in network/api/logs/logSender.go - Global logger mutation happens in dependency github.com/klever-io/klever-go-logger, profile.go, Apply()…

Published by the source

23 Sep 2026, 19:13 UTC

Last modified by the source

1 Oct 2026, 20:45 UTC

Source last checked

26 Oct 2026, 15:29 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-9v8p-frvj-2pcm

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6583

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-9v8p-frvj-2pcm

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# Patch Next advisory brief: CVE-2026-86064

Advisory: Klever-Go: /log controls global node logging
IDs: CVE-2026-86064, GHSA-9v8p-frvj-2pcm
Record: https://patchnext.com/advisories/cve-2026-86064 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/klever-io/klever-go 1.7.20. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/klever-io/klever-go: affected <= 1.7.19; fixed in 1.7.20

## Suggested inspection (read-only)
- Go github.com/klever-io/klever-go: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/klever-io/klever-go.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GO-2026-6583 (OSV record GO-2026-6583 lists affected ranges: Go github.com/klever-io/klever-go >=0 <1.7.20 (fixed))
- Verified: https://osv.dev/vulnerability/GHSA-9v8p-frvj-2pcm (OSV record GHSA-9v8p-frvj-2pcm lists affected ranges: Go github.com/klever-io/klever-go >=0 <1.7.20 (fixed))
- Verified: https://github.com/advisories/GHSA-9v8p-frvj-2pcm (GitHub-reviewed advisory GHSA-9v8p-frvj-2pcm lists affected ranges: Go github.com/klever-io/klever-go >=0 <=1.7.19)

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