{"id":"PYSEC-2026-1713","summary":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request in OctoPrint","details":"### Impact\n\nOctoPrint 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.\n\n### Patches\n\nThe vulnerability has been patched in version 1.11.2.\n\n### Workaround\n\nOctoPrint 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.\n\n### Details\n\nThe 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.\n\nThe fix adds detection of invalid requests like that and ensures they are handled gracefully with an HTTP 400 Bad Request response.\n\n### Credits\n\nThis vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.","aliases":["CVE-2025-48879","GHSA-9wj4-8h85-pgrw"],"modified":"2026-07-07T17:46:29.832163221Z","published":"2026-07-07T16:02:54.373804Z","references":[{"type":"WEB","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":"WEB","url":"https://github.com/OctoPrint/OctoPrint/commit/c9c35c17bd820f19c6b12e6c0359fc0cfdd0c1ec"},{"type":"PACKAGE","url":"https://github.com/OctoPrint/OctoPrint"},{"type":"PACKAGE","url":"https://pypi.org/project/octoprint"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-9wj4-8h85-pgrw"}],"affected":[{"package":{"name":"octoprint","ecosystem":"PyPI","purl":"pkg:pypi/octoprint"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.2"}]}],"versions":["1.10.0","1.10.0rc1","1.10.0rc2","1.10.0rc3","1.10.0rc4","1.10.1","1.10.2","1.10.3","1.11.0","1.11.0rc1","1.11.0rc2","1.11.0rc3","1.11.0rc4","1.11.0rc5","1.11.0rc6","1.11.0rc7","1.11.1","1.3.11","1.3.12","1.3.12rc1","1.3.12rc3","1.4.0","1.4.0rc1","1.4.0rc2","1.4.0rc3","1.4.0rc4","1.4.0rc5","1.4.0rc6","1.4.1","1.4.1rc1","1.4.1rc2","1.4.1rc3","1.4.1rc4","1.4.2","1.5.0","1.5.0rc1","1.5.0rc2","1.5.0rc3","1.5.1","1.5.2","1.5.3","1.6.0","1.6.0rc1","1.6.0rc2","1.6.0rc3","1.6.1","1.7.0","1.7.0rc1","1.7.0rc2","1.7.0rc3","1.7.1","1.7.2","1.7.3","1.8.0","1.8.0rc1","1.8.0rc2","1.8.0rc3","1.8.0rc4","1.8.0rc5","1.8.1","1.8.2","1.8.3","1.8.4","1.8.5","1.8.6","1.8.7","1.9.0","1.9.0rc1","1.9.0rc2","1.9.0rc3","1.9.0rc4","1.9.0rc5","1.9.0rc6","1.9.1","1.9.2","1.9.3"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/octoprint/PYSEC-2026-1713.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}