{"id":"PYSEC-2026-1400","summary":"Gakido vulnerable to HTTP Header Injection (CRLF Injection) ","details":"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.\n\nWhen 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.\n\n## Impact\n\nAn attacker who can control header values passed to Gakido's `Client.get()`, `Client.post()`, or other request methods could:\n\n1. **Inject arbitrary HTTP headers** - Add malicious headers to requests\n2. **HTTP Response Splitting** - Potentially manipulate responses in certain proxy configurations\n3. **Cache Poisoning** - Inject headers that could poison intermediate caches\n4. **Session Fixation** - Inject session-related headers\n5. **Bypass Security Controls** - Inject headers that bypass server-side security checks\n\n## Proof of Concept\n\n```python\nfrom gakido import Client\n\n# Before fix: X-Injected header would be sent as a separate header\nc = Client(impersonate=\"chrome_120\")\nr = c.get(\"https://httpbin.org/headers\", headers={\n    \"User-Agent\": \"test\\r\\nX-Injected: pwned\"\n})\n\n# The server would receive:\n# User-Agent: test\n# X-Injected: pwned\n```\n\n## Affected Code\n\nThe vulnerability existed in the header processing logic where user-supplied headers were not sanitized before being sent in HTTP requests.\n\n**File:** `gakido/headers.py`  \n**Function:** `canonicalize_headers()`\n\n## Fix\n\nThe fix 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.\n\n```python\ndef _sanitize_header(name: str, value: str) -\u003e tuple[str, str]:\n    \"\"\"\n    Sanitize header name and value to prevent HTTP header injection (CRLF injection).\n    Strips CR, LF, and null bytes from both name and value.\n    \"\"\"\n    clean_name = name.replace(\"\\r\", \"\").replace(\"\\n\", \"\").replace(\"\\x00\", \"\")\n    clean_value = value.replace(\"\\r\", \"\").replace(\"\\n\", \"\").replace(\"\\x00\", \"\")\n    return clean_name, clean_value\n```","aliases":["CVE-2026-24489","GHSA-gcgx-chcp-hxp9"],"modified":"2026-07-07T17:46:43.200924307Z","published":"2026-07-07T16:03:20.559426Z","references":[{"type":"WEB","url":"https://github.com/HappyHackingSpace/gakido/security/advisories/GHSA-gcgx-chcp-hxp9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24489"},{"type":"WEB","url":"https://github.com/HappyHackingSpace/gakido/commit/369c67e67c63da510c8a9ab021e54a92ccf1f788"},{"type":"PACKAGE","url":"https://github.com/HappyHackingSpace/gakido"},{"type":"WEB","url":"https://github.com/HappyHackingSpace/gakido/releases/tag/v0.1.1-1bc6019"},{"type":"PACKAGE","url":"https://pypi.org/project/gakido"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-gcgx-chcp-hxp9"}],"affected":[{"package":{"name":"gakido","ecosystem":"PyPI","purl":"pkg:pypi/gakido"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.1"}]}],"versions":["0.1.0"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/gakido/PYSEC-2026-1400.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}