Uses tmp library to ensure more secure tmp file creation#91
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sgoedecke merged 4 commits intoactions:mainfrom Aug 13, 2025
Merged
Uses tmp library to ensure more secure tmp file creation#91sgoedecke merged 4 commits intoactions:mainfrom
sgoedecke merged 4 commits intoactions:mainfrom
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Pull Request Overview
This PR enhances the security of temporary file creation by replacing manual temporary file handling with the tmp library. The change addresses a security vulnerability where temporary files were created with predictable filenames and potentially unsafe permissions.
- Replaces manual temporary file creation using
os.tmpdir()with the securetmplibrary - Removes the hardcoded filename constant and helper function for temporary directory handling
- Updates test expectations to match the new random filename pattern
Reviewed Changes
Copilot reviewed 3 out of 6 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| src/main.ts | Replaces manual temp file creation with secure tmp.fileSync() call and removes helper function |
| package.json | Adds tmp library and its TypeScript definitions as dependencies |
| tests/main.test.ts | Updates test expectation to match new random filename pattern |
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sgoedecke
approved these changes
Aug 13, 2025
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Currently this action creates temporary files using
os.tmpdir()with predictable filenames which results in files that could be readable by other system users.This PR replaces manual temporary file creation with the tmp library which automatically implements the following security best practices:
Automatic restrictive file permissions (0600 on Unix systems)
Secure temporary directory selection
Random filename generation
This change eliminates the information exposure risk while maintaining the same functionality.
Note: The tmp library uses an MIT license. Not sure what to do to get the license check to pass.