pyLoad has SSRF fix bypass via HTTP redirect_CVE-2026-35459

9.3 / 10

CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Description

pyLoad is a free and open-source download manager written in Python. In 0.5.0b3.dev96 and earlier, pyLoad has a server-side request forgery (SSRF) vulnerability. The fix for CVE-2026-33992 added IP validation to BaseDownloader.download() that checks the hostname of the initial download URL. However, pycurl is configured with FOLLOWLOCATION=1 and MAXREDIRS=10, causing it to automatically follow HTTP redirects. Redirect targets are never validated against the SSRF filter. An authenticated user with ADD permission can bypass the SSRF fix by submitting a URL that redirects to an internal address.

Basic Information

ID CVE-2026-35459

Source GitHub_M

Published Apr 6, 2026 at 19:37

Modified Apr 7, 2026 at 19:29

Affected Product

Vendor pyload

Product pyload

Version <= 0.5.0b3.dev96

Affected Versions pyload pyload <= 0.5.0b3.dev96

CWE Classification

CWE-918

References

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    "published": "2026-04-06T19:37:00.598Z",
    "modified": "2026-04-07T19:29:49.223Z",
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