What’s Vulnerable › Vulnerabilities

CVE-2026-35464: pyLoad has an incomplete fix for CVE-2026-33509: unprotected storage_folder enables arbitrary file write to Flask session store and code execution

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-07 · updated 2026-06-17
• Weakness: CWE-502

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.

Affected products

• pyload/pyload: before 2026-04-02 — fixed in 2026-04-02

How to fix

Upgrade to a fixed version: pyload/pyload 2026-04-02. Check the vendor advisory for mitigations.

References

• https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1
• https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j
• https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx
• https://www.cve.org/CVERecord?id=CVE-2026-33509
• https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j

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