{"id":"ALPINE-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.","modified":"2026-11-03T06:32:35.095648484Z","published":"2019-12-20T23:15:11.167Z","upstream":["CVE-2019-16785"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2019-16785"}],"affected":[{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.11","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}},{"package":{"name":"py3-waitress","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/py3-waitress?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2019-16785.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}