{"id":"PYSEC-2019-137","details":"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.","aliases":["CVE-2019-16786","GHSA-g2xc-35jw-c63p"],"modified":"2023-11-08T04:01:21.705659Z","published":"2019-12-20T23:15:00Z","references":[{"type":"ADVISORY","url":"https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63p"},{"type":"FIX","url":"https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3"},{"type":"WEB","url":"https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2020:0720"}],"affected":[{"package":{"name":"waitress","ecosystem":"PyPI","purl":"pkg:pypi/waitress"},"ranges":[{"type":"GIT","repo":"https://github.com/Pylons/waitress","events":[{"introduced":"0"},{"fixed":"f11093a6b3240fc26830b6111e826128af7771c3"}]},{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.1"}]}],"versions":["0.1","0.2","0.3","0.4","0.5","0.6","0.6.1","0.7","0.8","0.8.1","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.8.7","0.8.8","0.8.9","0.8.10","0.8.11b0","0.9.0b0","0.9.0b1","0.9.0","1.0a1","1.0a2","1.0.0","1.0.1","1.0.2","1.1.0","1.2.0b1","1.2.0b2","1.2.0b3","1.2.0","1.2.1","1.3.0b0","1.3.0"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/waitress/PYSEC-2019-137.yaml"}}],"schema_version":"1.7.3"}