{"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":"2026-05-17T11:53:57.904850770Z","published":"2019-12-20T23:15:11.167Z","related":["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"],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"source":"CPE_FIELD","vendor_product":"debian:debian_linux","extracted_events":[{"last_affected":"9.0"}]},{"cpes":["cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*"],"source":"CPE_FIELD","vendor_product":"fedoraproject:fedora","extracted_events":[{"last_affected":"30"},{"last_affected":"31"}]},{"cpes":["cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*"],"source":"CPE_FIELD","vendor_product":"oracle:communications_cloud_native_core_network_function_cloud_native_environment","extracted_events":[{"last_affected":"1.10.0"}]},{"cpes":["cpe:2.3:a:redhat:openstack:15:*:*:*:*:*:*:*"],"extracted_events":[{"last_affected":"15"}],"vendor_product":"redhat:openstack","source":"CPE_FIELD"}]},"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://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"EVIDENCE","url":"https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p"}],"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"}]}