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Rule Reference

SEC434lintai-ai-securitygovernancehardeningstablemarkdownwarn

AI markdown: raw.githubusercontent.com WebFetch grant

AI-native markdown frontmatter grants `WebFetch(domain:raw.githubusercontent.com)` authority

Public lane
governance
Category
hardening
Provider
lintai-ai-security
Scope
per-file
Surface
markdown
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message only
How to read this lane

Shared authority and workflow policy review.

How to read this category

Least-privilege, provenance, or operational hygiene signal.

Activation Model

Preset Activation

These presets explain where this rule appears in the product experience.

governancesidecar lane

Lifecycle

Stable Lifecycle Contract

State

stable

Graduation rationale

Checks AI-native frontmatter for explicit raw GitHub content fetch grants in shared allowed-tools policy.

Deterministic signal basis

MarkdownSignals exact frontmatter token detection for `WebFetch(domain:raw.githubusercontent.com)` inside allowed-tools or allowed_tools.

Malicious corpus
skill-webfetch-raw-github-allowed-tools
Benign corpus
skill-webfetch-raw-github-allowed-tools-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

SEC352AI markdown: unscoped Bash tool grantAI-native markdown frontmatter grants unscoped Bash tool accessgovernancehardeningmarkdown
SEC423AI markdown: bare Read tool grantAI-native markdown frontmatter grants bare `Read` tool accessgovernancehardeningmarkdown
SEC424AI markdown: bare Write tool grantAI-native markdown frontmatter grants bare `Write` tool accessgovernancehardeningmarkdown
SEC425AI markdown: bare Edit tool grantAI-native markdown frontmatter grants bare `Edit` tool accessgovernancehardeningmarkdown
SEC426AI markdown: bare Glob tool grantAI-native markdown frontmatter grants bare `Glob` tool accessgovernancehardeningmarkdown
SEC427AI markdown: bare Grep tool grantAI-native markdown frontmatter grants bare `Grep` tool accessgovernancehardeningmarkdown

SEC434 / MD-WEBFETCH-RAW-GITHUB ​

SEC434 flags AI-native markdown frontmatter when allowed-tools grants the exact token WebFetch(domain:raw.githubusercontent.com).

Why It Matters ​

raw.githubusercontent.com serves direct repository file contents. Granting that fetch target in shared AI instruction frontmatter makes mutable remote code and prompt content easier to ingest outside the normal repository review path.

Trigger Shape ​

The rule triggers only when all of these are true:

  • the file is an AI-native markdown instruction surface with parsed frontmatter
  • the path is not fixture-like
  • allowed-tools or allowed_tools contains the exact token WebFetch(domain:raw.githubusercontent.com)

Clean Cases ​

These stay clean:

  • narrower reviewed domains such as WebFetch(domain:github.com)
  • frontmatter that does not grant raw GitHub fetches
  • fixture-like examples under test or fixture paths

Example Trigger ​

md
---
allowed-tools:
  - WebFetch(domain:raw.githubusercontent.com)
  - Read
---

Safer Example ​

md
---
allowed-tools:
  - WebFetch(domain:github.com)
  - Read
---

How To Fix ​

Replace WebFetch(domain:raw.githubusercontent.com) with a narrower reviewed documentation host, or remove broad raw GitHub fetch authority from shared frontmatter entirely.