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Rule Reference

SEC589lintai-ai-securitystablejsonwarn

MCP config: bunx auto-approve

MCP configuration auto-approves `Bash(bunx ...)` through `autoApprove`

Provider
lintai-ai-security
Surface
json
Scope
per_file
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message_only

Activation Model

Preset Membership

This rule is part of the builtin activation graph through these preset memberships.

basemembership
mcpmembership

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Matches exact `Bash(bunx ...)` auto-approval in MCP client config.

Deterministic signal basis

JsonSignals exact array-item prefix detection for `autoApprove` entries starting with `Bash(bunx ` on parsed MCP configuration.

Malicious corpus
mcp-autoapprove-mutable-runner-family
Benign corpus
mcp-autoapprove-mutable-runner-family-specific-safe
structured evidence required remediation reviewed
Canonical note

Structural stable rule intended as a high-precision check with deterministic evidence.

Nearby Signals

Related Rules

SEC301MCP config: shell trampolineMCP configuration shells out through sh -c or bash -cjsonstable
SEC302Config: insecure HTTP endpointConfiguration contains an insecure http:// endpointjsonstable
SEC303MCP config: credential env passthroughMCP configuration passes through credential environment variablesjsonstable
SEC304Config: TLS verification disabledConfiguration disables TLS or certificate verificationjsonstable
SEC305Config: hardcoded auth materialConfiguration embeds static authentication material in a connection or auth valuejsonstable
SEC309Config: literal secrets in configConfiguration commits literal secret material in env, auth, or header valuesjsonstable

SEC589 / MCP-AUTOAPPROVE-BUNX ​

SEC589 flags MCP configuration when autoApprove includes a Bash(bunx ...) tool token.

Why It Matters ​

bunx runs packages from a mutable package source. Auto-approving it removes review from dynamic package execution.

Trigger Shape ​

  • the file is a detected MCP configuration surface
  • autoApprove is a string array
  • the array contains an item starting with Bash(bunx

How To Fix ​

Remove shared bunx auto-approval and keep mutable package execution under explicit user review.