CVE-2026-42315 json
pyLoad: Path Traversal via Package Folder Name in set_package_data
published 6mo ago modified 4mo ago also EUVD-2026-29123 , GHSA-838g-gr43-qqg9 , PYSEC-2026-129
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
Summary
pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev100, when passing a folder name in the set_package_data() API function call inside the data object with key "_folder", there is no sanitization at all, allowing a user with Perms.MODIFY to specify arbitrary directories as download locations for a package. This vulnerability is fixed in 0.5.0b3.dev100.
Patch / fix
- pypi pyload-ng 0.5.0b3.dev100
- pyload-ng_project pyload-ng 0.5.0b3.dev100
- pyload pyload 0.5.0b3.dev100
Is CVE-2026-42315 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/pyload/pyload/security/advisories/GHSA-838g-gr43-qqg9 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | pyload-ng | <0.5.0b3.dev100 |
0.5.0b3.dev100 |
Affected products
- pyload pyload
Classification
References
-
github.com
/pyload/pyload/security/advisories/GHSA-838g-gr43-qqg9
exploit, web, vendor-advisory, evidence
-
nvd.nist.gov
/vuln/detail/CVE-2026-42315
advisory
-
github.com
/pyload/pyload
package
-
github.com
/pypa/advisory-database/tree/main/vulns/pyload-ng/PYSEC-2026-129.yaml
web
Sources
- CVE List CVE-2026-42315
- GitHub Advisory GHSA-838g-gr43-qqg9
- NVD CVE-2026-42315
- OSV PYSEC-2026-129
Fencer Intel 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.