CVE-2026-35464 json
pyLoad has an incomplete fix for CVE-2026-33509: unprotected storage_folder enables arbitrary file write to Flask session store and code execution
published 2026-04-04 7 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-19661 , GHSA-4744-96p5-mp2j , PYSEC-2026-2989
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j referenced PoC, tagged "exploit" by a source, unverified
- github.com https://github.com/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | pyload-ng | <=0.5.0b3 |
no fix listed |
Affected products
- pyload pyload
Classification
References
-
github.com
/pyload/pyload/commit/c4cf995a2803bdbe388addfc2b0f323277efc0e1
web, patch
-
github.com
/pyload/pyload/security/advisories/GHSA-4744-96p5-mp2j
exploit, web, mitigation, vendor-advisory
-
github.com
/pyload/pyload/security/advisories/GHSA-r7mc-x6x7-cqxx
web, exploit, vendor-advisory
-
cve.org
/CVERecord?id=CVE-2026-33509
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-33509
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-35464
advisory
-
github.com
/pyload/pyload
package
-
pypi.org
/project/pyload-ng
package
-
github.com
/advisories/GHSA-4744-96p5-mp2j
advisory
Sources
- CVE List CVE-2026-35464
- GitHub Advisory GHSA-4744-96p5-mp2j
- NVD CVE-2026-35464
- OSV PYSEC-2026-2989
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.