Vulnerability · Published Aug 21, 2025 · Assigned by GitHub_M

CVE-2025-57751Denial-of-Service attack in pyLoad CNL Blueprint using dukpy.evaljs

High 7.7

In plain English

A high-severity uncontrolled resource consumption in pyload from pyload. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.7High

Exploit odds (30 days)0.3%top 74.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

pyLoad is the free and open-source Download Manager written in pure Python. The jk parameter is received in pyLoad CNL Blueprint. Due to the lack of jk parameter verification, the jk parameter input by the user is directly determined as dykpy.evaljs(), resulting in the server CPU being fully occupied and the web-ui becoming unresponsive. This vulnerability is fixed in 0.5.0b3.dev92.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	pyload-ng	0.5.0b3.dev92	GHSA-9gjj-6gj7-c4wj
PyPI	pyload-ng	0.5.0b3.dev92	PYSEC-2026-1815

Affected products (as reported)

Vendor	Product	Versions
pyload	pyload	< 0.5.0b3.dev92

Weakness: CWE-400 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

References

https://github.com/pyload/pyload/security/advisories/GHSA-9gjj-6gj7-c4wj x_refsource_CONFIRM