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Medium, CVSS 4.1

kube-router: BGP Peer Passwords Exposed in Logs at Verbose Logging Level

GHSA-fcmh-qfxc-w685

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/cloudnativelabs/kube-router/v2

    Affected
    >= 2.7.0, <= 2.8.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.1 · CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary When kube-router is configured with per-node BGP peer passwords using the kube-router.io/peer.passwords node annotation, and verbose logging is enabled (--v=2 or higher), the raw Kubernetes node annotation map is logged verbatim — including the base64-encoded BGP MD5 passwords. Anyone with access to kube-router's logs (via kubectl logs, log aggregation systems, or shared log dumps during debugging) can extract and decode the BGP peer passwords. The official troubleshooting documentation instructs users to collect logs at -v=2 before filing issues, making accidental disclosure during support interactions a realistic scenario. Details The vulnerability is at pkg/controllers/routing/networkroutescontroller.go:1129: node.Annotations is of type map[string]string. This type does not implement fmt.Stringer, so %+v formatting dumps every key-value pair verbatim. When kube-router.io/peer.passwords is set on the node (the documented mechanism for providing per-node BGP MD5 passwords),…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-fcmh-qfxc-w685

Agent brief

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# Patch Next advisory brief: GHSA-fcmh-qfxc-w685

Advisory: kube-router: BGP Peer Passwords Exposed in Logs at Verbose Logging Level
IDs: GHSA-fcmh-qfxc-w685
Record: https://patchnext.com/advisories/ghsa-fcmh-qfxc-w685 (revision 1, source checked 26 Oct 2026, 15:19 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/cloudnativelabs/kube-router/v2: affected >= 2.7.0, <= 2.8.0

## Suggested inspection (read-only)
- Go github.com/cloudnativelabs/kube-router/v2: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/cloudnativelabs/kube-router/v2.
- 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://github.com/advisories/GHSA-fcmh-qfxc-w685 (GitHub-reviewed advisory GHSA-fcmh-qfxc-w685 lists affected ranges: Go github.com/cloudnativelabs/kube-router/v2 >=2.7.0 <=2.8.0)

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