Vulnerability · Published Jun 10, 2025 · Assigned by GitHub_M
CVE-2025-48879OctoPrint Vulnerable to Denial of Service through malformed HTTP request
Medium 6.5
In plain English
A medium-severity infinite loop in OctoPrint from OctoPrint. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | octoprint | 1.11.2 | GHSA-9wj4-8h85-pgrw |
| PyPI | octoprint | 1.11.2 | PYSEC-2026-1713 |
Affected products (as reported)
Weakness: CWE-140, CWE-835 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H