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Vulnerability Details CVE-2019-16786

Waitress through version 1.3.1 would parse the Transfer-Encoding header and only look for a single string value, if that value was not chunked it would fall through and use the Content-Length header instead. According to the HTTP standard Transfer-Encoding should be a comma separated list, with the inner-most encoding first, followed by any further transfer codings, ending with chunked. Requests sent with: "Transfer-Encoding: gzip, chunked" would incorrectly get ignored, and the request would use a Content-Length header instead to determine the body size of the HTTP message. This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining. This issue is fixed in Waitress 1.4.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 65.6%
CVSS Severity
CVSS v3 Score 7.1
CVSS v2 Score 5.0
References
Products affected by CVE-2019-16786


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