CVE-2025-48879 – OctoPrint Denial of Service (DoS) Vulnerability

CVE ID : CVE-2025-48879

Published : June 10, 2025, 4:15 p.m. | 45 minutes ago

Description : OctoPrint versions up until and including 1.11.1 contain a vulnerability that allows any unauthenticated attacker to send a manipulated broken multipart/form-data request to OctoPrint and through that make the web server component become unresponsive. The issue can be triggered by a broken multipart/form-data request lacking an end boundary to any of OctoPrint’s endpoints implemented through the octoprint.server.util.tornado.UploadStorageFallbackHandler request handler. The request handler will get stuck in an endless busy loop, looking for a part of the request that will never come. As Tornado is single-threaded, that will effectively block the whole web server. The vulnerability has been patched in version 1.11.2.

Severity: 6.5 | MEDIUM

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