CVE-2026-33511: Pyload

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Pyload Pyload: up to and including 0.4.20
• Pyload-NG Project Pyload-NG: from 0.5.0a5.dev528, before 0.5.0b3.dev97 (fixed in 0.5.0b3.dev97)

Published 2026-03-24. Last modified 2026-06-17.