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Vulnerability record · CVE-2026-35464 · published 7 April 2026

CVE-2026-35464: Pyload deserialization of untrusted data vulnerability

Pyload · Pyload

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.

7.5 CVSS 3.1 High EPSS 0.61% · top 52.8% CWE-502 · Deserialization of untrusted dataCWE-863 · Incorrect authorization
7.5CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 3 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1 Patch
https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j ExploitMitigationVendor Advisory
https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx ExploitVendor Advisory
https://www.cve.org/CVERecord?id=CVE-2026-33509 Third Party Advisory
https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-35464), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.