CVE-2026-33314
Received Received - Intake
Host Header Spoofing in pyLoad Enables SSRF and DoS

Publication date: 2026-03-24

Last updated on: 2026-03-26

Assigner: GitHub, Inc.

Description
pyLoad is a free and open-source download manager written in Python. Prior to version 0.5.0b3.dev97, a Host Header Spoofing vulnerability in the @local_check decorator allows unauthenticated external attackers to bypass local-only restrictions. This grants access to the Click'N'Load API endpoints, enabling attackers to remotely queue arbitrary downloads, leading to Server-Side Request Forgery (SSRF) and Denial of Service (DoS). This issue has been patched in version 0.5.0b3.dev97.
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Meta Information
Published
2026-03-24
Last Modified
2026-03-26
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-14
NVD
CVE-2026-33314
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
pyload-ng_project pyload-ng to 0.5.0b3.dev97 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-346 The product does not properly verify that the source of data or communication is valid.
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
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Executive Summary

This vulnerability exists in pyLoad, a Python-based download manager, prior to version 0.5.0b3.dev97. It involves a Host Header Spoofing issue in the @local_check decorator, which allows unauthenticated external attackers to bypass restrictions meant to limit access to local-only resources.

By exploiting this flaw, attackers can gain access to the Click'N'Load API endpoints remotely, which normally should be restricted. This enables them to queue arbitrary downloads on the server.

The exploitation can lead to Server-Side Request Forgery (SSRF), where the server is tricked into making unintended requests, and Denial of Service (DoS), potentially disrupting the service.

The vulnerability has been fixed in version 0.5.0b3.dev97.

Impact Analysis

This vulnerability can impact you by allowing attackers to remotely queue arbitrary downloads on your pyLoad server without authentication.

Such unauthorized access can lead to Server-Side Request Forgery (SSRF), where attackers can make the server perform unintended requests, potentially accessing internal resources or causing other security issues.

Additionally, the vulnerability can cause Denial of Service (DoS), disrupting the availability of the download manager service.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade pyLoad to version 0.5.0b3.dev97 or later, where the Host Header Spoofing issue has been patched.

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