{"id":"CVE-2019-16785","details":"Waitress through version 1.3.1 implemented a \"MAY\" part of the RFC7230 which states: \"Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR.\" Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message. This issue is fixed in Waitress 1.4.0.","aliases":["GHSA-pg36-wpm5-g57p","PYSEC-2019-136"],"modified":"2026-03-19T03:20:08.135205Z","published":"2019-12-20T23:15:11.167Z","related":["GHSA-pg36-wpm5-g57p","MGASA-2020-0083","SUSE-RU-2020:2072-1","SUSE-RU-2020:2161-1","SUSE-SU-2020:1901-1","SUSE-SU-2020:3269-1","SUSE-SU-2020:3292-1","openSUSE-SU-2020:1911-1","openSUSE-SU-2020:1922-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2020:0720"},{"type":"ADVISORY","url":"https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"FIX","url":"https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba"},{"type":"EVIDENCE","url":"https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/Pylons/waitress","events":[{"introduced":"0"},{"last_affected":"05e965e02f9d73fa6db18a120da1bebcfe429ca2"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"1.3.1"}]}},{"type":"GIT","repo":"https://github.com/pylons/waitress","events":[{"introduced":"0"},{"fixed":"8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba"}]}],"versions":["0.1","0.2","0.3","0.4","0.5","0.6","0.6.1","0.7","0.8","0.8.1","0.8.10","0.8.11b0","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.8.7","0.8.8","0.8.9","0.9.0b0","v0.9.0","v0.9.0b1","v1.0.0","v1.0.1","v1.0.2","v1.0a1","v1.0a2","v1.1.0","v1.2.0","v1.2.0b1","v1.2.0b2","v1.2.0b3","v1.2.1","v1.3.0","v1.3.0b0","v1.3.1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-16785.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"1.10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]},{"events":[{"introduced":"0"},{"last_affected":"30"}]},{"events":[{"introduced":"0"},{"last_affected":"31"}]},{"events":[{"introduced":"0"},{"last_affected":"15"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}