python-multipart has a Denial of service (DoS) via deformation `multipart/form-data` boundary

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

不加限制或调节的资源分配

python-multipart 安全漏洞

python-multipart是Marcelo Trylesinski个人开发者的一个Python的流式多部分解析器。 python-multipart 0.0.18之前版本存在安全漏洞，该漏洞源于处理表单数据时对边界前后内容的不当处理及过度日志记录，可能导致攻击者通过发送特制请求引发高CPU负载和拒绝服务。

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