CVE-2025-48879

Description

### Impact 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. This could be used to effectively run a denial of service attack on the OctoPrint server. ### Patches The vulnerability has been patched in version 1.11.2. ### Workaround OctoPrint administrators are once more reminded to not make OctoPrint available on hostile networks (e.g. the internet), regardless of whether this vulnerability is patched or not. ### Details 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 fix adds detection of invalid requests like that and ensures they are handled gracefully with an HTTP 400 Bad Request response. ### Credits This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.

How to fix CVE-2025-48879

To remediate CVE-2025-48879, upgrade the affected package to a fixed version below.

• —upgrade to 1.11.2 or later

Is CVE-2025-48879 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 1.11.2

CVSS scores