{"id":"CVE-2025-48879","aliases":["GHSA-9wj4-8h85-pgrw","PYSEC-2026-1713"],"title":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request in OctoPrint","summary":"OctoPrint Vulnerable to Denial of Service through malformed HTTP request in OctoPrint","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"octoprint","product":"octoprint","ecosystem":"pip","affected":["octoprint < 1.11.2"],"patched":["octoprint 1.11.2"],"published":"2025-06-10","updated":"2026-07-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-9wj4-8h85-pgrw","references":[{"url":"https://github.com/OctoPrint/OctoPrint/security/advisories/GHSA-9wj4-8h85-pgrw"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48879"},{"url":"https://github.com/OctoPrint/OctoPrint/commit/c9c35c17bd820f19c6b12e6c0359fc0cfdd0c1ec"},{"url":"https://github.com/OctoPrint/OctoPrint"}],"tags":["osv","pip"],"epss":0.00256,"epssPercentile":0.17522,"ingestedAt":"2026-07-08T18:25:48.107Z","slug":"CVE-2025-48879","body":"## Overview\n\n### 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.\n\n## Affected packages\n\n- `octoprint < 1.11.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `octoprint 1.11.2`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}