pyLoad up to 0.5.0b3.dev96 HTTP Redirect BaseDownloader.download server-side request forgery

Summaryinfo

A vulnerability was found in pyLoad up to 0.5.0b3.dev96. It has been declared as critical. The impacted element is the function BaseDownloader.download of the component HTTP Redirect Handler. Executing a manipulation can lead to server-side request forgery. This vulnerability appears as CVE-2026-35459. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in pyLoad up to 0.5.0b3.dev96 and classified as critical. This vulnerability affects the function BaseDownloader.download of the component HTTP Redirect Handler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-35459 since 04/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/06/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• pyLoad

Version

• 0.5.0b3.dev96

Website

• Product: https://github.com/pyload/pyload/

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