by Kastro
Paper/Archive/CVE-2026-33511

CVE-2026-33511

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

EPSS 0.4%public exploitCVSS 9.8
critical.is priorityof 100
47
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 38.1.381 × 207.6Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
pyload>= 0.4.20, < 0.5.0b3.dev97–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)8.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:L/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References

exploitgithub.com/pyload/pyload/security/advisories/GHSA-g5j2-gxqh-x7pw