OS Command Injection in pyload-ng (CVE-2026-35463)
Summary
OS command injection in pyload-ng (CVE-2026-35463). Successful exploitation can lead to full system takeover. Exploitable via GET /files/get/etc/passwd.
Original description
The description as published by the source.
Summary
The ADMIN_ONLY_OPTIONS protection mechanism restricts security-critical configuration values (reconnect scripts, SSL certs, proxy credentials) to admin-only access. However, this protection is only applied to core config options, not to plugin config options. The AntiVirus plugin stores an executable path (avfile) in its config, which is passed directly to subprocess.Popen(). A non-admin user with SETTINGS permission can change this path to achieve remote code execution.
Details
Safe wrapper — ADMIN_ONLY_OPTIONS (core/api/init.py:225-235):
ADMIN_ONLY_OPTIONS = {
"reconnect.script", # Blocks script path change
"webui.host", # Blocks bind address change
"ssl.cert_file", # Blocks cert path change
"ssl.key_file", # Blocks key path change
# ... other sensitive options
}
Where it IS enforced — core config (core/api/init.py:255):
def set_config_value(self, section, option, value):
if f"{section}.{option}" in ADMIN_ONLY_OPTIONS:
if not self.user.is_admin:
raise PermissionError("Admin only")
# ...
Where it is NOT enforced — plugin config (core/api/init.py:271-272):
# Plugin config - NO admin check at all
self.pyload.config.set_plugin(category, option, value)
Dangerous sink — AntiVirus plugin (plugins/addons/AntiVirus.py:75):
def scan_file(self, file):
avfile = self.config.get…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2026-35463 has been found in pyload-ng.
Attackers can target a specific entry point like GET /files/get/etc/passwd over the network to misuse the product.
Successful exploitation can lead to full system takeover.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "pyload-ng CVE-2026-35463" on the vendor's site.
CVE-2026-35463 (pyload-ng) — CWE-78
Attack vector: remote (network-reachable) / no user interaction
Attack surface: GET /files/get/etc/passwd / ADMIN_ONLY_OPTIONS / AntiVirus / avfile
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.
OS command injection (CWE-78) exists in pyload-ng. Attackers reach the vulnerable code path via GET /files/get/etc/passwd.
Check the vendor advisory for the affected versions of pyload-ng. Attack surface: GET /files/get/etc/passwd / ADMIN_ONLY_OPTIONS / AntiVirus / avfile.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual GET /files/get/etc/passwd requests with malformed payloads or SQL meta-characters. 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。 -
2Hunt for indicators of compromise detect
grep 'GET /files/get/etc/passwd' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
GET /files/get/etc/passwdへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Post-deployment verification verify
Replay attack against GET /files/get/etc/passwd on staging to confirm patch closes the vector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 Step 2 と同じログクエリ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