scan-for-secrets 0.3

2026-04-06 · Source: Simon Willison's Weblog · Field: Technology & Digital — Software Development & Engineering, Cybersecurity & Data Privacy · Depth: Novice, quick

Summary

The `scan-for-secrets` tool, version 0.3, has been released, introducing a new `-r/--redact` command-line option. This feature allows users to identify potential secrets within files, confirm their presence, and then automatically replace all detected matches with the string "REDACTED", while correctly handling various escaping rules. Additionally, the update includes a new Python function, `redact_file(file_path: str | Path, secrets: list[str], replacement: str = "REDACTED") -> int`, providing programmatic access to the redaction functionality. This release enhances the utility of the tool for sanitizing files before sharing them publicly or with third parties.

Key takeaway

For DevOps Engineers preparing codebases or documentation for public release, you should integrate `scan-for-secrets 0.3` into your pre-commit hooks or CI/CD pipelines. This ensures that sensitive information is automatically detected and redacted, minimizing the risk of accidental exposure and maintaining data hygiene before files leave your control.

Key insights

The `scan-for-secrets` tool now offers both CLI and programmatic secret redaction capabilities.

Principles

• Automate sensitive data removal
• Confirm before redacting

Method

The tool scans files for secrets, prompts for user confirmation, and then replaces identified matches with "REDACTED", respecting file-specific escaping rules.

In practice

• Use `-r/--redact` before sharing files
• Integrate `redact_file()` into CI/CD

Topics

• scan-for-secrets
• Secret Scanning
• Data Redaction
• Python Library
• File Security

Code references

• simonw/scan-for-secrets

Best for: Software Engineer, Security Engineer, DevOps Engineer

Related on AIssential

• scan-for-secrets 0.2 — Version 0.2 of `scan-for-secrets` enhances secret detection with streaming results and flexible scanning options.
• scan-for-secrets 0.1 — The `scan-for-secrets` tool prevents accidental secret exposure by scanning files for literal and encoded keys.
• GitHub Expands Secret Scanning with General Availability of MCP Server Integration — GitHub's MCP Server integration extends secret scanning to AI-driven workflows, enabling automated credential detection and remediation.
• How a Poisoned Security Scanner Became the Key to Backdooring LiteLLM — Compromised CI/CD tools can enable supply chain attacks by exfiltrating publisher credentials to inject malicious code into legitimate packages.
• aquasecurity / trivy — Trivy is a comprehensive security scanner for diverse targets and issue types.
• Building a Production-Grade CI/CD Pipeline — Part 2: Adding AI-Powered Security Scanning — AI synthesis dramatically improves security scan actionability by transforming raw findings into concise, prioritized reports.

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Editorial summary, takeaway, and curation by AIssential. Original article published by Simon Willison's Weblog.