CVE-2025-53890 json
pyLoad vulnerable to remote code execution through js2py onCaptchaResult
published 2025-07-14 15 mo ago modified 2026-09-10 1 mo ago also EUVD-2025-21406 , GHSA-8w3f-4r8f-pf53 , PYSEC-2026-496
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
pyload is an open-source Download Manager written in pure Python. An unsafe JavaScript evaluation vulnerability in pyLoad’s CAPTCHA processing code allows unauthenticated remote attackers to execute arbitrary code in the client browser and potentially the backend server. Exploitation requires no user interaction or authentication and can result in session hijacking, credential theft, and full system remote code execution. Commit 909e5c97885237530d1264cfceb5555870eb9546, the patch for the issue, is included in version 0.5.0b3.dev89.
Patch / fix
- pypi pyload-ng 0.20
- pyload-ng_project pyload-ng 0.5.0b3.dev89
- pyload pyload 0.5.0b3.dev89
- github.com/pyload/pyload@909e5c9 commit
- github.com/pyload/pyload#4586 pull request
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 15 mo ago
Exploit prediction
1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/pyload/pyload/security/advisories/GHSA-8w3f-4r8f-pf53 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | pyload-ng | <0.20 |
0.20 |
Affected products
- pyload pyload
Classification
References
-
github.com
/pyload/pyload/pull/4586
web
-
github.com
/pyload/pyload/commit/909e5c97885237530d1264cfceb5555870eb9546
web
-
github.com
/pyload/pyload/security/advisories/GHSA-8w3f-4r8f-pf53
exploit, web
-
nvd.nist.gov
/vuln/detail/CVE-2025-53890
advisory
-
github.com
/pyload/pyload
package
-
pypi.org
/project/pyload-ng
package
-
github.com
/advisories/GHSA-8w3f-4r8f-pf53
advisory
Sources
- CVE List CVE-2025-53890
- GitHub Advisory GHSA-8w3f-4r8f-pf53
- NVD CVE-2025-53890
- OSV PYSEC-2026-496
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.