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EUVD-2026-281152

fkie_cve-2026-35459

pyLoad is a free and open-source download manager written in Python. In 0.5.0b3.dev96 and earlier, pyLoad has a server-side request forgery (SSRF) vulnerability. The fix for CVE-2026-33992 added IP validation to BaseDownloader.download() that checks the hostname of the initial download URL. However, pycurl is configured with FOLLOWLOCATION=1 and MAXREDIRS=10, causing it to automatically follow HTTP redirects. Redirect targets are never validated against the SSRF filter. An authenticated user with ADD permission can bypass the SSRF fix by submitting a URL that redirects to an internal address.

GHSA-7gvf-3w72-p2pg — pyLoad: SSRF filter bypass via HTTP redirect in BaseDownloader (Incomplete fix for CVE-2026-33992)

Affected: PyPI: pyload-ng

## Summary

The fix for CVE-2026-33992 (GHSA-m74m-f7cr-432x) added IP validation to `BaseDownloader.download()` that checks the hostname of the initial download URL. However, pycurl is configured with `FOLLOWLOCATION=1` and `MAXREDIRS=10`, causing it to automatically follow HTTP redirects. Redirect targets are never validated against the SSRF filter.

An authenticated user with ADD permission can bypass the SSRF fix by submitting a URL that redirects to an internal address.

## Root Cause

The SSRF check at `src/pyload/plugins/base/downloader.py:335-341` validates only the initial URL:

dl_hostname = urllib.parse.urlparse(dl_url).hostname if is_ip_address(dl_hostname) and not is_global_address(dl_hostname): self.fail(...) else: for ip in host_to_ip(dl_hostname): if not is_global_address(ip): self.fail(...)

After the check passes, `_download()` is called. pycurl is configured at `src/pyload/core/network/http/http_request.py:114-115` to follow redirects:

self.c.setopt(pycurl.FOLLOWLOCATION, 1) self.c.setopt(pycurl.MAXREDIRS, 10)

No `CURLOPT_REDIR_PROTOCOLS` restriction is set anywhere in HTTPRequest. Redirect targets bypass the SSRF filter entirely.

## PoC

Redirect server (attacker-controlled):

from http.server import HTTPServer, BaseHTTPRequestHandler

class RedirectHandler(BaseHTTPRequestHandler): def do_GET(self): self.send_response(302) self.send_header("Location",…

PYSEC-2026-495 — pyLoad: SSRF filter bypass via HTTP redirect in BaseDownloader (Incomplete fix for CVE-2026-33992)