Vulnerability in pyload-ng (CVE-2026-44226)
Summary
Vulnerability in pyload-ng (CVE-2026-44226). Risk of unauthorized operations or information disclosure. Exploitable via filename. Mitigation: upgrade to 0.5.0b3.dev100 or later.
Original description
The description as published by the source.
Summary
pyload-ng WebUI returns full Python traceback details to clients on unhandled exceptions.
Because /web/ is reachable without authentication and renders attacker-controlled template names, an unauthenticated user can reliably trigger a server exception (for example by requesting a non-existent template) and receive internal stack traces in the HTTP response.
Details
The issue is caused by the combination of:
- Unauthenticated template-render route:
src/pyload/webui/app/blueprints/app_blueprint.py:32-36@bp.route("/web/", endpoint="web")data = render_template(filename)with user-controlledfilename- no
@login_required(...)on this route
- Global exception handler exposes traceback to response:
src/pyload/webui/app/handlers.py:14-27tb = traceback.format_exc()messages.extend(tb.split('\n'))- returned in rendered error page for all exceptions
- Error page renders all
messages:
src/pyload/webui/app/themes/modern/templates/base.html:217-219- loops over
messagesand prints them in response HTML
- loops over
So any unhandled exception can disclose internal implementation details (stack frames, source paths, exception metadata) to remote unauthenticated clients.
This is a core behavior issue in default WebUI error handling
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().…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-44226 has been found in pyload-ng.
Attackers can target a specific entry point like filename over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade pyload-ng to 0.5.0b3.dev100 or later.
If unsure, ask your IT team or search "pyload-ng CVE-2026-44226" on the vendor's site.
CVE-2026-44226 (pyload-ng) — CWE-209 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: filename / messages
Patched: 0.5.0b3.dev100 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-209) exists in pyload-ng. Attackers reach the vulnerable code path via filename without authentication.
Check the vendor advisory for the affected versions of pyload-ng. Attack surface: filename / messages.
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.
Update to 0.5.0b3.dev100.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'pyload-ng' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'pyload-ng' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
pyload-ngを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade pyload-ng to 0.5.0b3.dev100ステージング環境で 0.5.0b3.dev100 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com