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EUVD-2026-266650

fkie_cve-2026-24489

Gakido is a Python HTTP client focused on browser impersonation and anti-bot evasion. A vulnerability was discovered in Gakido prior to version 0.1.1 that allowed HTTP header injection through CRLF (Carriage Return Line Feed) sequences in user-supplied header values and names. When making HTTP requests with user-controlled header values containing `\r\n` (CRLF), `\n` (LF), or `\x00` (null byte) characters, an attacker could inject arbitrary HTTP headers into the request. The fix in version 0.1.1 adds a `_sanitize_header()` function that strips `\r`, `\n`, and `\x00` characters from both header names and values before they are included in HTTP requests.

GHSA-gcgx-chcp-hxp9 — Gakido vulnerable to HTTP Header Injection (CRLF Injection)

Affected: PyPI: gakido

A vulnerability was discovered in Gakido that allowed HTTP Header Injection through CRLF (Carriage Return Line Feed) sequences in user-supplied header values and names.

When making HTTP requests with user-controlled header values containing `\r\n` (CRLF), `\n` (LF), or `\x00` (null byte) characters, an attacker could inject arbitrary HTTP headers into the request.

## Impact

An attacker who can control header values passed to Gakido's `Client.get()`, `Client.post()`, or other request methods could:

1. **Inject arbitrary HTTP headers** - Add malicious headers to requests 2. **HTTP Response Splitting** - Potentially manipulate responses in certain proxy configurations 3. **Cache Poisoning** - Inject headers that could poison intermediate caches 4. **Session Fixation** - Inject session-related headers 5. **Bypass Security Controls** - Inject headers that bypass server-side security checks

## Proof of Concept

```python from gakido import Client

# Before fix: X-Injected header would be sent as a separate header c = Client(impersonate="chrome_120") r = c.get("https://httpbin.org/headers", headers={ "User-Agent": "test\r\nX-Injected: pwned" })

# The server would receive: # User-Agent: test # X-Injected: pwned ```

## Affected Code

The vulnerability existed in the header processing logic where user-supplied headers were not sanitized before being sent in HTTP requests.

**File:** `gakido/headers.py` **Function:** `canonicalize_headers()`

## Fix

The fix adds a `_sanit…

PYSEC-2026-1400 — Gakido vulnerable to HTTP Header Injection (CRLF Injection)