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CVE-2026-33511— pyload-ng: Authentication Bypass via Host Header Injection in ClickNLoad

Quick assessment

Affected
pyload pyload
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 0.4.20版本至0.5.0b3.dev97之前版本存在安全漏洞，该漏洞源于ClickNLoad功能中的local_check装饰器可通过HTTP Host标头欺骗被绕过，可能导致未经身份验证的远程用户访问本地主机限制的端点。

AI Predicted 9.8 Difficulty: Easy EPSS 0.62% · P48
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I. Basic Information for CVE-2026-33511

Vulnerability Information
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Vulnerability Title
pyload-ng: Authentication Bypass via Host Header Injection in ClickNLoad
Source: CVE Program / CVE List V5
Vulnerability Description
pyLoad is a free and open-source download manager written in Python. From version 0.4.20 to before version 0.5.0b3.dev97, the local_check decorator in pyLoad's ClickNLoad feature can be bypassed by any remote attacker through HTTP Host header spoofing. This allows unauthenticated remote users to access localhost-restricted endpoints, enabling them to inject arbitrary downloads, write files to the storage directory, and execute JavaScript code. This issue has been patched in version 0.5.0b3.dev97.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
pyLoad 安全漏洞
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 0.4.20版本至0.5.0b3.dev97之前版本存在安全漏洞，该漏洞源于ClickNLoad功能中的local_check装饰器可通过HTTP Host标头欺骗被绕过，可能导致未经身份验证的远程用户访问本地主机限制的端点。
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 >= 0.4.20, < 0.5.0b3.dev97 -

II. Public POCs for CVE-2026-33511

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III. Intelligence Information for CVE-2026-33511

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Vendor Advisories for CVE-2026-33511 (1)

Same Patch Batch · pyload · 2026-03-24 · 3 CVEs total

CVE-2026-33509 7.5 HIGH pyload-ng: SETTINGS Permission Users Can Achieve Remote Code Execution via Unrestricted Re
CVE-2026-33314 6.5 MEDIUM pyload-ng: Improper Authentication and Origin Validation Error

IV. Related Vulnerabilities

Same product: pyload
Same vendor: pyload
Same weakness: CWE-639

V. Comments for CVE-2026-33511

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