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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

Published: Apr 7, 2026Updated: Apr 23, 2026 Sources: CVE List NVDCWE-502
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 59.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-502CWE-863

Affected Products

pyloadpyload
On-prem
Consumer Software / file-utility
pyloadoss-projectConsumer Softwareaka pyload/pyload

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

4 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1
github.com
https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j
github.com
https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx
github.com
and 1 more references View all →

Timeline

Published
Apr 7, 2026
Last Updated
Apr 23, 2026

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