Vulnerability · Published Apr 7, 2026 · Assigned by GitHub_M
CVE-2026-35464pyLoad has an incomplete fix for CVE-2026-33509: unprotected storage_folder enables arbitrary file write to Flask session store and code execution
High 7.5
In plain English
A high-severity unsafe deserialization in pyload from pyload. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | pyload-ng | no fix listed | GHSA-4744-96p5-mp2j |
| PyPI | pyload-ng | no fix listed | PYSEC-2026-2989 |
Affected products (as reported)
Weakness: CWE-502, CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j x_refsource_CONFIRM
- https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx x_refsource_MISC
- https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1 x_refsource_MISC
- https://www.cve.org/CVERecord?id=CVE-2026-33509 x_refsource_MISC