{"id":"CVE-2024-53981","aliases":["GHSA-59g5-xgcq-4qw3","PYSEC-2026-1851"],"url":"https://o3.security/vulnerability/CVE-2024-53981","summary":"python-multipart has a Denial of service (DoS) via deformation `multipart/form-data` boundary","details":"python-multipart is a streaming multipart parser for Python. When parsing form data, python-multipart skips line breaks (CR \\r or LF \\n) in front of the first boundary and any tailing bytes after the last boundary. This happens one byte at a time and emits a log event each time, which may cause excessive logging for certain inputs. An attacker could abuse this by sending a malicious request with lots of data before the first or after the last boundary, causing high CPU load and stalling the processing thread for a significant amount of time. In case of ASGI application, this could stall the event loop and prevent other requests from being processed, resulting in a denial of service (DoS). This vulnerability is fixed in 0.0.18.","published":"2024-12-02T15:57:50.232Z","modified":"2026-08-08T03:47:50.693121603Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"python-multipart","fixedVersion":"0.0.18"}],"fix":{"url":"https://github.com/Kludex/python-multipart/commit/c4fe4d3cebc08c660e57dd709af1ffa7059b3177","label":"Kludex/python-multipart@c4fe4d3"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53981.json"},{"type":"ADVISORY","url":"https://github.com/Kludex/python-multipart/security/advisories/GHSA-59g5-xgcq-4qw3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53981"},{"type":"FIX","url":"https://github.com/Kludex/python-multipart/commit/c4fe4d3cebc08c660e57dd709af1ffa7059b3177"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:47:50.693121603Z"}}