CVE-2026-35464: Pyload insecure deserialization (CVSS 7.5)

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 breakdown

Attack vectorNetwork

Attack complexityHigh

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Pyload< 2026-04-02

Remediation

Fixed in

Pyload≥ 2026-04-02

Patch & vendor advisories

References

https://github.com/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1Patch
https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2jExploitMitigationVendor Advisory
https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxxExploitVendor Advisory
https://www.cve.org/CVERecord?id=CVE-2026-33509Third Party Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-35464 being actively exploited?

CVE-2026-35464 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.61%.

How severe is CVE-2026-35464?

CVE-2026-35464 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2026-35464?

Affected products include Pyload.

How do I fix CVE-2026-35464?

Upgrade affected software to a fixed version, for example Pyload 2026-04-02 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-35464 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo