CVE-2025-48879 OctoPrint Vulnerable to Denial of Service through malformed HTTP request
Unauthenticated attackers can crash the OctoPrint web server by sending malformed multipart requests, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-48879?
CVE-2025-48879 is a medium-severity denial of service vulnerability in OctoPrint, published on 10 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Which versions are affected by CVE-2025-48879?
3 open source packages ship an affected version, including octoprint and OctoPrint. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
octoprint PyPI | All versions | 1.11.2 |
octoprint PyPI | All versions | 1.11.2 |
OctoPrint PyPI | All versions | 1.11.2 |
Products include Octoprint Octoprint.
How do I fix CVE-2025-48879?
Upgrade octoprint to 1.11.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-48879 being exploited?
There is no known exploitation of CVE-2025-48879 in the wild and no public exploit code.
Other vulnerabilities in OctoPrint
- CVE-2018-16710 Information disclosure in n/a
- CVE-2025-58180 OctoPrint is Vulnerable to RCE Attacks via Unsanitized Filename in File Upload
- CVE-2022-1430 Cross-site Scripting (XSS) - DOM in octoprint/octoprint
- CVE-2022-1432 Cross-site Scripting (XSS) - Generic in octoprint/octoprint
- CVE-2024-32977 OctoPrint Authentication Bypass via X-Forwarded-For Header when autologinLocal is enabled
Sources
Also known as GHSA-9wj4-8h85-pgrw, PYSEC-2026-1713.