Auth bypass in Pyload
CVE-2026-33511
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Pyload — versions >= 0.4.20, < 0.5.0b3.dev97
- Pyload-Ng Project
Weakness classification (CWE)
References
- github.com/pyload/pyload/security/advisories/GHSA-g5j2-gxqh-x7pw (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33511?
- CVE-2026-33511 is a critical-severity vulnerability in Pyload, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.8/10. Published 2026-03-24.
- How severe is CVE-2026-33511?
- Critical severity. CVSS v3 base score is 9.8 out of 10.