Vulnerability in Octoprint
CVE-2025-48879
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (16.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Octoprint — versions < 1.11.2
Weakness classification (CWE)
References
- github.com/OctoPrint/OctoPrint/security/advisories/GHSA-9wj4-8h85-pgrw (Mitigation, Vendor Advisory)
- github.com/OctoPrint/OctoPrint/commit/c9c35c17bd820f19c6b12e6c0359fc0cfdd0c1ec (Patch)
Frequently asked questions
- What is CVE-2025-48879?
- CVE-2025-48879 is a medium-severity vulnerability in Octoprint, classified under CWE-140. CVSS score: 6.5/10. Published 2025-06-10.
- How severe is CVE-2025-48879?
- Medium severity. CVSS v3 base score is 6.5 out of 10.