CVE-2026-33511

CRITICAL

pyload-ng: Authentication Bypass via Host Header Injection in ClickNLoad

Title source: cna

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.

References (1)

[X_Refsource_Confirm] https://github.com/pyload/pyload/security/advisories/GHSA-g5j2-gxqh-x7pw

Scores

CVSS v3 9.8

EPSS 0.0012

EPSS Percentile 31.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-639

Status published

Products (3)

pyload/pyload < 0.4.20

pyload/pyload >= 0.4.20, < 0.5.0b3.dev97

pyload-ng_project/pyload-ng 0.5.0a5.dev528 - 0.5.0b3.dev97

Published Mar 24, 2026

Tracked Since Mar 25, 2026