{"cve":"CVE-2019-16792","nvd":{"published":"2020-01-22T19:15:11.140","modified":"2026-06-17T02:22:48.853","status":"Modified","description":"Waitress through version 1.3.1 allows request smuggling by sending the Content-Length header twice. Waitress would header fold a double Content-Length header and due to being unable to cast the now comma separated value to an integer would set the Content-Length to 0 internally. If two Content-Length headers are sent in a single request, Waitress would treat the request as having no body, thereby treating the body of the request as a new request in HTTP pipelining. This issue is fixed in Waitress 1.4.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-444"],"references":["https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes","https://github.com/Pylons/waitress/commit/575994cd42e83fd772a5f7ec98b2c56751bd3f65","https://github.com/Pylons/waitress/security/advisories/GHSA-4ppp-gpcr-7qf6","https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html","https://www.oracle.com/security-alerts/cpuapr2022.html"],"products":["agendaless:waitress","debian:debian_linux","oracle:communications_cloud_native_core_network_function_cloud_native_environment"],"source":"nvd","synced_at":"2026-10-19T21:01:01.339895972+00:00"},"epss":{"cve":"CVE-2019-16792","score":0.01984,"percentile":0.80579,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4ppp-gpcr-7qf6","url":"https://osv.dev/vulnerability/GHSA-4ppp-gpcr-7qf6","summary":"HTTP Request Smuggling: Content-Length Sent Twice in Waitress","modified":"2026-07-08T06:00:30.894868366Z","packages":[{"ecosystem":"PyPI","name":"waitress","purl":"pkg:pypi/waitress","ranges":["<1.4.0"],"fixed":["1.4.0"]}]},{"id":"PYSEC-2020-178","url":"https://osv.dev/vulnerability/PYSEC-2020-178","summary":"","modified":"2023-11-08T04:01:21.890990Z","packages":[{"ecosystem":"PyPI","name":"waitress","purl":"pkg:pypi/waitress","ranges":["<1.4.0"],"fixed":["1.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}