# busboy@1.6.0 security report (npm)

- Verdict: **Needs review** (risk level: medium)
- Scanned: 2026-10-04T16:54:43.000Z
- Files reviewed: 11
- Findings: 3 low severity findings
- Report: https://security.togoder.click/npm/busboy
- Source: Togoder Security (https://security.togoder.click), AI source-code review

## Summary

Togoder Security scanned the npm package busboy@1.6.0 on Oct 4, 2026. An AI review of 11 source files produced 3 low severity findings. The overall verdict is medium: the findings flag risky but common patterns (dynamic code, unsafe defaults, broad file or network access) rather than confirmed malware.

## Findings

### [low] Monkey-patching internal methods

Finding ID: `NPS-3DD86418C75E`

File: `bench/bench-multipart-files-100mb-small.js`

The multiparty case hijacks internal methods (onParseHeaderField, onParseHeaderValue, etc.) to count calls. This is a benchmark instrumentation technique and not a security issue in itself, but demonstrates a pattern of overriding library internals.

### [low] Resource exhaustion / DoS potential

Finding ID: `NPS-9079FA8818C7`

File: `bench/bench-multipart-files-100mb-small.js:8`

The benchmark creates 100 multipart file parts of 1 MB each (100 MB total) and sets parser limits to Infinity (fieldSizeLimit, maxFieldsSize, maxFields, maxFilesSize). This is intentionally benchmarking performance, but if such code were used in a production context it would allow unbounded resource consumption. In a benchmark file it is expected, so risk is low in context.

### [low] Dynamic module loading from command-line input

Finding ID: `NPS-1088267CC5BB`

File: `bench/bench-multipart-files-100mb-small.js:47`

The script uses process.argv[2] as the module name to require() from a fixed allowlist (busboy, formidable, multiparty). The allowlist prevents arbitrary module loading, so risk is low, but still worth noting as a pattern.

## Files reviewed

- `bench/bench-multipart-files-100mb-small.js` (medium): The file is a legitimate multipart parser benchmark with no malicious behavior; findings are limited to intentional unbounded limits and internal method hijacking used for benchmarking, not exploitation.
- `.eslintrc.js` (safe): Cleared by Jev triage; no further analysis needed
- `bench/bench-multipart-fields-100mb-big.js` (safe): The file is a legitimate multipart parser benchmark script with no malicious behavior, network activity, or filesystem manipulation.
- `bench/bench-multipart-fields-100mb-small.js` (safe): This is a benchmark script for comparing multipart parsers with no malicious patterns detected.
- `bench/bench-multipart-files-100mb-big.js` (safe): This is a legitimate multipart parsing benchmark script with no malicious patterns detected.
- `bench/bench-urlencoded-fields-100pairs-small.js` (safe): This is a benchmark script for comparing URL-encoded form parsers; it only reads process.argv and requires known parser modules, with no malicious patterns.
- `bench/bench-urlencoded-fields-900pairs-small-alt.js` (safe): No malicious patterns detected; this is a legitimate benchmark script for comparing URL-encoded form parsers.
- `lib/index.js` (safe): Cleared by Jev triage; no further analysis needed
- `lib/types/multipart.js` (safe): No malicious patterns detected in this multipart form-data parser implementation.
- `lib/types/urlencoded.js` (safe): No malicious patterns detected; the code is a standard URL-encoded form parser with no network, filesystem, process, or obfuscated behavior.
- `lib/utils.js` (safe): No malicious patterns detected; the file contains standard HTTP content-type and disposition parsing utilities with no network, filesystem, process, or dynamic code execution activity.

AI analysis is guidance, not a guarantee. Methodology: https://security.togoder.click/methodology