Advisories for Pypi/Sanic package

Sanic's HTTP/1.1 chunked-body handling does not fully consume the trailer-part after the terminating 0\r\n chunk. Because of that, attacker-controlled bytes left in the connection buffer after the first chunked request can be interpreted as the start of a new HTTP request on the same keep-alive connection. In the attached verified proof, a single outer POST / request that correctly returns 405 Method Not Allowed is followed, within the same TCP …

Sanic is an opensource python web server/framework. Affected versions of sanic allow access to lateral directories when using app.static if using encoded %2F URLs. Parent directory traversal is not impacted. Users are advised to upgrade. There is no known workaround for this issue.

Sanic before 0.5.1 allows reading arbitrary files with directory traversal, as demonstrated by the /static/..%2f substring.

Sanic officially supports Python versions 3.6, 3.7, 3.8, and 3.9. However, if you accidentally run it with version 3.10 (which is not supported by Sanic), your server is prone to crashing on an incoming web request.