TI-2026-27695 Aliases CVE-2026-35592 GHSA-mvwx-582f-56r7

pyLoad has an Incomplete Tar Path Traversal Fix in UnTar._safe_extractall via os.path.commonprefix Bypass

MEDIUM 62CWE-22Published 2026-04-07 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev97, the _safe_extractall() function in src/pyload/plugins/extractors/UnTar.py uses os.path.commonprefix() for its path traversal check, which performs character-level string comparison rather than path-level comparison. This allows a specially crafted tar archive to write files outside the intended extraction directory. The correct function os.path.commonpath() was added to the codebase in the CVE-2026-32808 fix (commit 5f4f0fa) but was never applied to _safe_extractall(), making this an incomplete fix. This vulnerability is fixed in 0.5.0b3.dev97.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00265 18th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed pyload (pyload): 0.5.0b3.dev97pyload-ng (PyPI): 0.5.0b3.dev97

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
pyload	pyload	before 0.5.0b3.dev97	0.5.0b3.dev97	Patch available	CNA
—	pyload-ng (PyPI)	before 0.5.0b3.dev97	0.5.0b3.dev97	Patch available	GHSA-mvwx-582f-56r7

pyload Vendorpyload Affected before 0.5.0b3.dev97 Fixed in 0.5.0b3.dev97 Patch available CNA
pyload-ng (PyPI) Vendor— Affected before 0.5.0b3.dev97 Fixed in 0.5.0b3.dev97 Patch available GHSA-mvwx-582f-56r7

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:pyload-ng_project:pyload-ng::::::python::*	up to 0.5.0b3.dev96	Vulnerable	Pyload-ng Project

cpe:2.3:a:pyload-ng_project:pyload-ng:*:*:*:*:*:python:*:* Versions up to 0.5.0b3.dev96 Vulnerable ·Pyload-ng Project

Remediation

Fix · CNA pyload (pyload) Fixed in 0.5.0b3.dev97
Fix · GHSA-mvwx-582f-56r7 pyload-ng (PyPI) Fixed in 0.5.0b3.dev97 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-35592
2026-10-03 Alias added: GHSA-mvwx-582f-56r7

References

Exploit 1

https://github.com/pyload/pyload/security/advisories/GHSA-mvwx-582f-56r7

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-35592

Other 2

TI-2023-00282 Code Injection in pyload/pyload CVSS 3.1CRITICAL 9.8
TI-2025-34556 pyLoad CNL Blueprint is vulnerable to Path Traversal through `dlc_path` leading to Remote Code Execution (RCE) CVSS 3.1CRITICAL 9.8
TI-2025-33765 pyLoad vulnerable to remote code execution through js2py onCaptchaResult CVSS 3.1CRITICAL 9.8
TI-2023-00412 Excessive Attack Surface in pyload/pyload CVSS 3.1CRITICAL 9.8
TI-2026-27589 pyLoad has SSRF fix bypass via HTTP redirect CVSS 4.0CRITICAL 9.3
TI-2026-26332 pyLoad: Server-Side Request Forgery via Download Link Submission Enables Cloud Metadata Exfiltration CVSS 4.0CRITICAL 9.3

See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences