Affected: npm: axios

# Vulnerability Disclosure: Null Byte Injection via Reverse-Encoding in AxiosURLSearchParams

## Summary

The `encode()` function in `lib/helpers/AxiosURLSearchParams.js` contains a character mapping (`charMap`) at line 21 that **reverses** the safe percent-encoding of null bytes. After `encodeURIComponent('\x00')` correctly produces the safe sequence `%00`, the charMap entry `'%00': '\x00'` converts it back to a raw null byte.

This is a clear encoding defect: every other charMap entry encodes in the safe direction (literal → percent-encoded), while this single entry decodes in the opposite (dangerous) direction.

**Severity:** Low (CVSS 3.7) **Affected Versions:** All versions containing this charMap entry **Vulnerable Component:** `lib/helpers/AxiosURLSearchParams.js:21`

## CWE

- **CWE-626:** Null Byte Interaction Error (Poison Null Byte) - **CWE-116:** Improper Encoding or Escaping of Output

## CVSS 3.1

**Score: 3.7 (Low)**

Vector: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N`

| Metric | Value | Justification | |---|---|---| | Attack Vector | Network | Attacker controls input parameters remotely | | Attack Complexity | High | Standard axios request flow (`buildURL`) uses its own `encode` function which does NOT have this bug. Only triggered via direct `AxiosURLSearchParams.toString()` without an encoder, or via custom `paramsSerializer` delegation | | Privileges Required | None | No authentication needed | | User Interaction | None | No user interaction required |…