{"id":"CVE-2025-48879","aliases":["EUVD-2025-17675","GHSA-9wj4-8h85-pgrw","PYSEC-2026-1713"],"status":"published","title":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request","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.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00267,"percentile":0.18954,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-140","CWE-835"],"published":"2025-06-10T15:23:54Z","modified":"2026-10-28T02:30:51Z","fixes":[{"ecosystem":"PyPI","package":"octoprint","fixed_in":["1.11.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"octoprint","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.2"}]}]},{"source":"osv","ecosystem":"PyPI","package":"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"]},{"source":"osv","ecosystem":"PyPI","package":"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"]}],"products":[{"vendor":"octoprint","product":"octoprint"}],"references":[{"url":"https://github.com/OctoPrint/OctoPrint/security/advisories/GHSA-9wj4-8h85-pgrw","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/OctoPrint/OctoPrint/commit/c9c35c17bd820f19c6b12e6c0359fc0cfdd0c1ec","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48879","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9wj4-8h85-pgrw","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48879.json","tags":["advisory"]},{"url":"https://github.com/OctoPrint/OctoPrint","tags":["package"]},{"url":"https://pypi.org/project/octoprint","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-48879","title":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request","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.","status":"published","published":"2025-06-10T15:23:54.15Z","modified":"2025-06-10T15:57:42.371Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-140","CWE-835"],"updated_at":"2026-11-02T14:32:41.089134Z"}],"euvd":[{"id":"EUVD-2025-17675","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.","status":"published","published":"2025-06-10T15:23:54Z","modified":"2025-06-10T15:57:42Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T20:32:26.841647Z"}],"ghsa":[{"id":"GHSA-9wj4-8h85-pgrw","title":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request in OctoPrint","description":"### 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.","status":"published","published":"2025-06-10T20:14:43Z","modified":"2025-06-10T20:14:45Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-140","CWE-835"],"updated_at":"2026-11-02T14:38:46.901955Z"}],"nvd":[{"id":"CVE-2025-48879","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.","status":"published","published":"2025-06-10T16:15:41.513Z","modified":"2026-06-17T09:30:25.317Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-140","CWE-835"],"updated_at":"2026-11-02T14:11:11.4244Z"}],"osv":[{"id":"CVE-2025-48879","title":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request","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.","status":"published","published":"2025-06-10T15:23:54.15Z","modified":"2026-10-28T02:30:51.723600231Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-140","CWE-835"],"updated_at":"2026-11-02T15:44:50.037003Z"},{"id":"GHSA-9wj4-8h85-pgrw","title":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request in OctoPrint","description":"### 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.","status":"published","published":"2025-06-10T20:14:43Z","modified":"2026-07-07T17:57:29.314500598Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-140","CWE-835"],"updated_at":"2026-11-02T15:46:44.225359Z"},{"id":"PYSEC-2026-1713","title":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request in OctoPrint","description":"### 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.","status":"published","published":"2026-07-07T16:02:54.373804Z","modified":"2026-07-07T17:46:29.832163221Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:55.06457Z"}]}}