CVE-2026-50125 MKP: Unbounded Pod Log Read via Attacker-Controlled `limitBytes`/`tailLines` Causes Memory Exhaustion
A remote attacker can exhaust memory and crash the MKP Kubernetes MCP server by sending unbounded log read requests via the unauthenticated get_resource tool.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50125?
CVE-2026-50125 is a high-severity denial of service vulnerability in StacklokLabs mkp, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2026-50125?
3 open source packages ship an affected version, including github.com/StacklokLabs/mkp.
| Package | Affected | Fixed in |
|---|---|---|
github.com/StacklokLabs/mkp Go | All versions | 0.4.1 |
github.com/StacklokLabs/mkp Go | All versions | 0.4.1 |
github.com/StacklokLabs/mkp Go | All versions | 0.4.1 |
How do I fix CVE-2026-50125?
Upgrade github.com/StacklokLabs/mkp to 0.4.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-50125 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50125 exists.
Sources
Also known as GHSA-qw5r-ppcg-f8rj, GO-2026-5978.