StacklokLabs Mkp up to 0.4.0 Pod Logs Subresource pkg/k8s/subresource.go buildPodLogOpts limitBytes/tailLines allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in StacklokLabs Mkp up to 0.4.0. This affects the function buildPodLogOpts of the file pkg/k8s/subresource.go of the component Pod Logs Subresource. Such manipulation of the argument limitBytes/tailLines leads to allocation of resources. This vulnerability is referenced as CVE-2026-50125. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in StacklokLabs Mkp up to 0.4.0 and classified as problematic. Affected by this issue is the function buildPodLogOpts of the file pkg/k8s/subresource.go of the component Pod Logs Subresource. The manipulation of the argument limitBytes/tailLines with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-50125 since 06/03/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 0.4.1 eliminates this vulnerability.

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Productinfo

Vendor

• StacklokLabs

Name

• Mkp

Version

• 0.1
• 0.2
• 0.3
• 0.4.0

Website

• Product: https://github.com/StacklokLabs/mkp/

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