codeguard-0-file-handling-and-uploads Cursor ruleA
codeguard-0-file-handling-and-uploads from santosomar/ai-agents-for-cybersecurity is a Cursor rule: instructions the Cursor agent follows in that repo.
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-file-handling-and-uploads.mdc@v1.5.0Pins v1.5.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 14 of 14 checks passed
- Kind
- Cursor rule
- Repository
- santosomar/ai-agents-for-cybersecurity
- Path
.cursor/rules/codeguard-0-file-handling-and-uploads.mdc- Versions recorded
- 2
- Latest version
- v1.5.0, committed Oct 12, 2026
- First version recorded
- Oct 19, 2025
- Size
- 3,596 bytes
- Repository stars
- 251
- License
- BSD-3-Clause
Secure file handling & uploads (validation, storage isolation, scanning, safe delivery).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
rule_id: codeguard-0-file-handling-and-uploads ## File Upload Security Guidelines This rule advises on secure file upload practices to prevent malicious file attacks and protect system integrity: - Extension Validation - List allowed extensions only for business-critical functionality. - Ensure input validation is applied before validating extensions. - Avoid double extensions (e.g., `.jpg.php`) and null byte injection (e.g., `.php%00.jpg`). - Use allowlist approach rather than denylist for file extensions. - Validate extensions after decoding filename to prevent bypass attempts. - Content Type and File Signature Validation - Never trust client-supplied Content-Type headers as they can be spoofed. - Validate file signatures (magic numbers) in conjunction with Content-Type checking. - Implement allowlist approach for MIME types as a quick protection layer. - Use file signature validation but not as a standalone security measure. - Filename Security - Generate random filenames (UUID/GUID) instead of using user-supplied names. - If user filenames required, implement maximum length limits. …
Read the whole file at its exact version.
How to install
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-file-handling-and-uploads.mdc@sha256:70ee72c0cf3135f6The line at the top of this page pins the label v1.5.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_rnkl5vso76dlbpth)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 19, 2025 and Oct 12, 2026, about one every 358 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.5.0 latest | 2026-10-12 | 227a2b6 | 3,596 B | A | view · diff |
| v1.0.0 | 2025-10-19 | 52abd04 | 3,598 B | A | view |
Audit of the latest version
- pass: Size between 200 bytes and 200 KB (3596 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
santosomar/ai-agents-for-cybersecurity · 251 stars · license BSD-3-Clause · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rnkl5vso76dlbpth GET https://markdownregistry.com/api/v1/resolve?ref=santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-file-handling-and-uploads.mdc GET https://markdownregistry.com/api/v1/blob/70ee72c0cf3135f6681442c025ef5cb16a71f9535ae61d9cb95bf903d9cb02e8
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Guides: Cursor rules vs AGENTS.md · which agent file does what.