Auth bypass in Pyload
CVE-2026-35464
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Pyload — versions <= 0.5.0b3.dev96
Weakness classification (CWE)
References
- github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j (Exploit, Mitigation, Vendor Advisory)
- github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx (Exploit, Vendor Advisory)
- github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1 (Patch)
- www.cve.org/CVERecord (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-35464?
- CVE-2026-35464 is a high-severity vulnerability in Pyload, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2026-04-07.
- How severe is CVE-2026-35464?
- High severity. CVSS v3 base score is 7.5 out of 10.