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CVE-2025-54140— pyLoad has Path Traversal Vulnerability in json/upload Endpoint that allows Arbitrary File Write

Quick assessment

Affected
pyload pyload
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

pyLoad是pyLoad开源的一个用 Python 编写的免费开源下载管理器。 pyLoad 0.5.0b3.dev89版本存在路径遍历漏洞，该漏洞源于/json/upload端点存在路径遍历，可能导致任意文件写入。

CVSS 7.5 · High EPSS 0.65% · P49
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I. Basic Information for CVE-2025-54140

Vulnerability Information
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Vulnerability Title
pyLoad has Path Traversal Vulnerability in json/upload Endpoint that allows Arbitrary File Write
Source: CVE Program / CVE List V5
Vulnerability Description
pyLoad is a free and open-source Download Manager written in pure Python. In version 0.5.0b3.dev89, an authenticated path traversal vulnerability exists in the /json/upload endpoint of pyLoad. By manipulating the filename of an uploaded file, an attacker can traverse out of the intended upload directory, allowing them to write arbitrary files to any location on the system accessible to the pyLoad process. This may lead to: Remote Code Execution (RCE), local privilege escalation, system-wide compromise, persistence, and backdoors. This is fixed in version 0.5.0b3.dev90.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
pyLoad 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pyLoad是pyLoad开源的一个用 Python 编写的免费开源下载管理器。 pyLoad 0.5.0b3.dev89版本存在路径遍历漏洞，该漏洞源于/json/upload端点存在路径遍历，可能导致任意文件写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pyload pyload >= 0.5.0b3.dev89, < 0.5.0b3.dev90 -

II. Public POCs for CVE-2025-54140

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6189 chars
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III. Intelligence Information for CVE-2025-54140

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Vendor Advisories for CVE-2025-54140 (1)

IV. Related Vulnerabilities

Same product: pyload
Same vendor: pyload
Same weakness: CWE-22

V. Comments for CVE-2025-54140

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