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High

pyLoad has an Arbitrary File Write via Path Traversal in edit_package()

  • Disclosed: 05.03.2026
  • Updated: 11.10.2026 12:19

The edit_package() function implements insufficient sanitization for the pack_folder parameter. The current protection relies on a single-pass string replacement of "../", which can be bypassed using crafted recursive traversal sequences.

Exploitation

An authenticated user with MODIFY permission can bypass the sanitization by submitting a payload such as: pack_folder=..././..././..././tmp

After the single-pass replacement, this becomes: ../../../tmp

Because the traversal sequences are not properly validated, the resulting normalized path escapes the intended storage directory and writes files to /tmp or other locations.

Affected software

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PlatformPackageVulnerable versionsFixed in
Python (PyPI) pyload-ng >= 0.5.0b3.dev13, < 0.5.0b3.dev97 0.5.0b3.dev97

References

CVSS score 7.1/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Weakness (CWE)
CWE-23
Platform
Python (PyPI)
Package
pyload-ng
Disclosed
05.03.2026
Updated
11.10.2026 12:19

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-121 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-6px9-j4qr-xfjw - CC BY 4.0

Vulnerability history: pyload-ng

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (58) in the archive
Total entries
58
First → latest
01.2023 10.2026
Without a fix
24
Exploited in attacks
0

Severity breakdown

  • Critical 9
  • High 23
  • Medium 25
  • Low 1

Disclosures per year

Severity:
  1. pyload-ng: getUserData/get_userdata exposed at Perms.ANY allow any authenticated account to brute-force the administrator password
    High · 8.1 ghsa-68w4-83fh-f2w8 >= 0.5.0b3.dev1, <= 0.5.0b3.dev101 no fix
  2. pyLoad: Privilege revocation and password change through the REST API do not invalidate the user's session
    High · 7.5 ghsa-jq7h-wrvp-3rgx <= 0.5.0b3.dev101 no fix
  3. pyLoad: Api.set_user_permission never invalidates the target's session
    High · 7.5 ghsa-889w-m37p-88m5 >= 0.5.0b3.dev98, <= 0.5.0b3.dev101 no fix
  4. pyLoad: Tar extraction creates device nodes and FIFOs (member types not filtered; tarfile extractall without filter=)
    High ghsa-fr26-jjhm-638c <= 0.5.0b3.dev101 no fix
  5. pyLoad has an authentication bypass in API key validation (check_apikey cache)
    High · 8.1 ghsa-r44w-v6gf-x3p6 < 0.5.0b3.dev101 0.5.0b3.dev101
  6. pyLoad is vulnerable to stored XSS in Downloads view via unsanitized link URL in packages.js template literal
    High · 8.7 CVE-2026-45348 <= 0.5.0b3.dev99 no fix
  7. PyLoad vulnerable to Path Traversal via Package Folder Name in set_package_data
    High · 8.1 CVE-2026-42315 < 0.5.0b3.dev100 0.5.0b3.dev100
  8. pyload-ng: non-admin SETTINGS users can redirect all outbound traffic through an attacker-controlled proxy via unrestricted `proxy.*` config (incomplete fix for CVE-2026-33509 / -35463 / -35464 / -35586)
    High · 8.3 CVE-2026-42313 < 0.5.0b3.dev100 0.5.0b3.dev100
  9. pyLoad has Stale Session Privilege After Role/Permission Change (Privilege Revocation Bypass)
    High · 8.8 CVE-2026-41133 <= 0.5.0b3.dev97 no fix
  10. pyLoad: Unprotected storage_folder enables arbitrary file write to Flask session store and code execution (Incomplete fix for CVE-2026-33509)
    High · 7.5 CVE-2026-35464 <= 0.5.0b3 no fix
  11. pyLoad: Improper Neutralization of Special Elements used in an OS Command
    High · 8.8 CVE-2026-35463 <= 0.5.0b3.dev96 no fix
  12. pyLoad: SSRF filter bypass via HTTP redirect in BaseDownloader (Incomplete fix for CVE-2026-33992)
    Critical CVE-2026-35459 <= 0.5.0b3.dev96 no fix
  13. pyLoad: SSRF in parse_urls API endpoint via unvalidated URL parameter
    High · 7.7 CVE-2026-35187 <= 0.5.0b3.dev96 no fix
  14. pyLoad: Server-Side Request Forgery via Download Link Submission Enables Cloud Metadata Exfiltration
    Critical CVE-2026-33992 <= 0.5.0b3.dev96 no fix
  15. pyLoad SETTINGS Permission Users Can Achieve Remote Code Execution via Unrestricted Reconnect Script Configuration
    High · 7.5 CVE-2026-33509 >= 0.4.0, <= 0.5.0b3.dev96 no fix
  16. pyLoad has an Arbitrary File Write via Path Traversal in edit_package() this entry
    High · 7.1 CVE-2026-29778 >= 0.5.0b3.dev13, < 0.5.0b3.dev97 0.5.0b3.dev97
  17. pyLoad CNL and captcha handlers allow Code Injection via unsanitized parameters
    High · 8.1 CVE-2025-61773 < 0.5.0b3.dev91 0.5.0b3.dev91
  18. Denial-of-Service attack in pyLoad CNL Blueprint using dukpy.evaljs
    High CVE-2025-57751 < 0.5.0b3.dev92 0.5.0b3.dev92
  19. PyLoad vulnerable to SQL Injection via API /json/add_package in add_links parameter
    High CVE-2025-55156 < 0.5.0b3.dev91 0.5.0b3.dev91
  20. pyLoad CNL Blueprint allows Path Traversal through `dlc_path` which leads to Remote Code Execution (RCE)
    Critical · 9.8 CVE-2025-54802 < 0.5.0b3.dev90 0.5.0b3.dev90
  21. `pyLoad` has Path Traversal Vulnerability in `json/upload` Endpoint that allows Arbitrary File Write
    High · 7.5 CVE-2025-54140 >= 0.5.0b3.dev89, < 0.5.0b3.dev90 0.5.0b3.dev90
  22. pyLoad vulnerable to XSS through insecure CAPTCHA
    Critical · 9.8 CVE-2025-53890 < 0.20 0.20
  23. pyLoad is vulnerable to attacks that bypass localhost restrictions, enabling the creation of arbitrary packages
    High · 7.5 CVE-2025-7346 <= 0.5.0b3.dev88 no fix
  24. pyLoad vulnerable to remote code execution by download to /.pyload/scripts using /flashgot API
    High · 9.1 CVE-2024-47821 < 0.5.0b3.dev87 0.5.0b3.dev87
  25. pyload-ng vulnerable to RCE with js2py sandbox escape
    Critical · 9.8 CVE-2024-39205 <= 0.5.0b3.dev85 no fix
  26. pyLoad allows upload to arbitrary folder lead to RCE
    Critical · 9.1 CVE-2024-32880 <= 0.5.0 no fix
  27. Cross-Site Request Forgery on any API call in pyLoad may lead to admin privilege escalation
    Critical · 9.6 CVE-2024-22416 < 0.5.0b3.dev78 0.5.0b3.dev78
  28. pyload Unauthenticated Flask Configuration Leakage vulnerability
    High · 7.5 CVE-2024-21644 < 0.5.0b3.dev77 0.5.0b3.dev77
  29. Download to arbitrary folder can lead to RCE
    High · 7.6 CVE-2023-47890 < 0.5.0b3.dev75 0.5.0b3.dev75
  30. Improper Certificate Validation in pyload-ng
    High · 7.4 CVE-2023-0509 < 0.5.0b3.dev44 0.5.0b3.dev44
  31. Excessive Attack Surface in pyload-ng
    Critical · 9.8 CVE-2023-0435 < 0.5.0b3.dev41 0.5.0b3.dev41
  32. Code Injection in pyload-ng
    Critical · 9.8 CVE-2023-0297 < 0.5.0b3.dev31 0.5.0b3.dev31

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