GuardDog is a CLI tool to identify malicious PyPI packages. From 2.6.0 to 2.9.0, GuardDog includes attacker-controlled filenames, file locations, messages, and code snippets in its default human-readable output without escaping terminal control characters. A malicious package can therefore inject ANSI or OSC escape sequences into analyst terminals or CI logs.

Affected: PyPI: guarddog

# Summary GuardDog includes attacker-controlled filenames, file locations, messages, and code snippets in its default human-readable output without escaping terminal control characters. A malicious package can therefore inject ANSI or OSC escape sequences into analyst terminals or CI logs.

# Description The finding formatter stores file paths and snippets from scanned content:

```python location = file_path + ":" + str(start_line) finding = { "location": location, "code": code, "message": result["extra"]["message"], } ```

The human-readable reporter later prints these values directly:

```python " * " + finding["message"] + " at " + finding["location"] + "\n " + _format_code_line_for_output(finding["code"]) ```

No escaping is applied for control characters such as `\x1b`. A malicious package can therefore ship a filename like:

```text evil\x1b[2J.py ```

or matched source lines containing terminal escapes, which survive into the final CLI output.

# Reproduction summary 1. Create a file whose name contains `\x1b[2J`. 2. Feed a semgrep-style result referencing that file into `Analyzer._format_semgrep_response()`. 3. Render the result with `HumanReadableReporter.print_scan_results()`. 4. The output string contains the raw escape bytes, which a terminal may interpret.

# Key code paths - `guarddog/analyzer/analyzer.py:377-392` - `guarddog/reporters/human_readable.py:36-42` - `guarddog/reporters/human_readable.py:84-91`

# Practical impact This can be used t…

Affected: PyPI: guarddog

# Summary GuardDog includes attacker-controlled filenames, file locations, messages, and code snippets in its default human-readable output without escaping terminal control characters. A malicious package can therefore inject ANSI or OSC escape sequences into analyst terminals or CI logs.

# Description The finding formatter stores file paths and snippets from scanned content:

```python location = file_path + ":" + str(start_line) finding = { "location": location, "code": code, "message": result["extra"]["message"], } ```

The human-readable reporter later prints these values directly:

```python " * " + finding["message"] + " at " + finding["location"] + "\n " + _format_code_line_for_output(finding["code"]) ```

No escaping is applied for control characters such as `\x1b`. A malicious package can therefore ship a filename like:

```text evil\x1b[2J.py ```

or matched source lines containing terminal escapes, which survive into the final CLI output.

# Reproduction summary 1. Create a file whose name contains `\x1b[2J`. 2. Feed a semgrep-style result referencing that file into `Analyzer._format_semgrep_response()`. 3. Render the result with `HumanReadableReporter.print_scan_results()`. 4. The output string contains the raw escape bytes, which a terminal may interpret.

# Key code paths - `guarddog/analyzer/analyzer.py:377-392` - `guarddog/reporters/human_readable.py:36-42` - `guarddog/reporters/human_readable.py:84-91`

# Practical impact This can be used t…