{"id":"CVE-2025-48879","aliases":["GHSA-9wj4-8h85-pgrw","PYSEC-2026-1713"],"url":"https://o3.security/vulnerability/CVE-2025-48879","summary":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request","details":"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":"2025-06-10T15:23:54.150Z","modified":"2026-07-15T01:49:06.607919250Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"octoprint","fixedVersion":"1.11.2"}],"fix":{"url":"https://github.com/OctoPrint/OctoPrint/commit/c9c35c17bd820f19c6b12e6c0359fc0cfdd0c1ec","label":"OctoPrint/OctoPrint@c9c35c1"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48879.json"},{"type":"ADVISORY","url":"https://github.com/OctoPrint/OctoPrint/security/advisories/GHSA-9wj4-8h85-pgrw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48879"},{"type":"FIX","url":"https://github.com/OctoPrint/OctoPrint/commit/c9c35c17bd820f19c6b12e6c0359fc0cfdd0c1ec"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:06.607919250Z"}}