Inappropriate implementation in File Input in Google Chrome prior to 149

#!/usr/bin/env python3
# check_chrome_cve_2026_11228.py
# Determine whether Google Chrome installed on this host is vulnerable to CVE-2026-11228.
# Vulnerable: Chrome version < 149.0.7827.53
# Outputs one of: VULNERABLE / PATCHED / UNKNOWN
# Exit codes: 0=PATCHED, 1=VULNERABLE, 2=UNKNOWN

import os
import platform
import re
import shutil
import subprocess
import sys
from typing import List, Optional, Tuple

FIXED = (149, 0, 7827, 53)
VERSION_RE = re.compile(r'(\d+)\.(\d+)\.(\d+)\.(\d+)')


def parse_version(text: str) -> Optional[Tuple[int, int, int, int]]:
    m = VERSION_RE.search(text or '')
    if not m:
        return None
    return tuple(int(x) for x in m.groups())


def cmp_ver(a: Tuple[int, int, int, int], b: Tuple[int, int, int, int]) -> int:
    return (a > b) - (a < b)


def run_cmd(cmd: List[str]) -> Optional[str]:
    try:
        out = subprocess.check_output(cmd, stderr=subprocess.STDOUT, text=True, timeout=10)
        return out.strip()
    except Exception:
        return None


def check_windows() -> List[Tuple[str, Tuple[int, int, int, int]]]:
    found = []
    paths = [
        os.path.expandvars(r'%ProgramFiles%\Google\Chrome\Application\chrome.exe'),
        os.path.expandvars(r'%ProgramFiles(x86)%\Google\Chrome\Application\chrome.exe'),
        os.path.expandvars(r'%LocalAppData%\Google\Chrome\Application\chrome.exe'),
    ]

    for p in paths:
        if p and os.path.exists(p):
            out = run_cmd(['wmic', 'datafile', 'where', f'name="{p.replace('\\', '\\\\')}"', 'get', 'Version', '/value'])
            ver = parse_version(out or '')
            if ver:
                found.append((p, ver))

    reg_queries = [
        r'HKLM\SOFTWARE\Google\Chrome\BLBeacon',
        r'HKLM\SOFTWARE\WOW6432Node\Google\Chrome\BLBeacon',
        r'HKCU\Software\Google\Chrome\BLBeacon',
    ]
    for key in reg_queries:
        out = run_cmd(['reg', 'query', key, '/v', 'version'])
        ver = parse_version(out or '')
        if ver:
            found.append((key, ver))

    return dedupe(found)


def check_macos() -> List[Tuple[str, Tuple[int, int, int, int]]]:
    found = []
    paths = [
        '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome',
        os.path.expanduser('~/Applications/Google Chrome.app/Contents/MacOS/Google Chrome'),
    ]
    for p in paths:
        if os.path.exists(p):
            out = run_cmd([p, '--version'])
            ver = parse_version(out or '')
            if ver:
                found.append((p, ver))
    return dedupe(found)


def check_linux() -> List[Tuple[str, Tuple[int, int, int, int]]]:
    found = []
    bins = ['google-chrome', 'google-chrome-stable', 'chromium', 'chromium-browser']
    for b in bins:
        exe = shutil.which(b)
        if exe:
            out = run_cmd([exe, '--version'])
            ver = parse_version(out or '')
            if ver:
                found.append((exe, ver))
    return dedupe(found)


def dedupe(items: List[Tuple[str, Tuple[int, int, int, int]]]) -> List[Tuple[str, Tuple[int, int, int, int]]]:
    seen = set()
    result = []
    for path, ver in items:
        key = (path, ver)
        if key not in seen:
            seen.add(key)
            result.append((path, ver))
    return result


def main() -> int:
    system = platform.system().lower()
    if 'windows' in system:
        installs = check_windows()
    elif 'darwin' in system:
        installs = check_macos()
    elif 'linux' in system:
        installs = check_linux()
    else:
        print('UNKNOWN')
        print(f'Unsupported platform: {platform.system()}')
        return 2

    if not installs:
        print('UNKNOWN')
        print('No Chrome/Chromium installation detected or version could not be read.')
        return 2

    vulnerable = []
    patched = []
    for loc, ver in installs:
        if cmp_ver(ver, FIXED) < 0:
            vulnerable.append((loc, ver))
        else:
            patched.append((loc, ver))

    if vulnerable:
        print('VULNERABLE')
        for loc, ver in vulnerable:
            print(f'{loc}: {".".join(map(str, ver))} < {".".join(map(str, FIXED))}')
        return 1

    if patched:
        print('PATCHED')
        for loc, ver in patched:
            print(f'{loc}: {".".join(map(str, ver))} >= {".".join(map(str, FIXED))}')
        return 0

    print('UNKNOWN')
    return 2


if __name__ == '__main__':
    sys.exit(main())