{"cve":"CVE-2019-16869","nvd":{"published":"2019-09-26T16:15:11.690","modified":"2026-10-08T22:16:50.473","status":"Modified","description":"Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a \"Transfer-Encoding : chunked\" line), which leads to HTTP request smuggling.","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://access.redhat.com/errata/RHSA-2019:3892","https://access.redhat.com/errata/RHSA-2019:3901","https://access.redhat.com/errata/RHSA-2020:0159","https://access.redhat.com/errata/RHSA-2020:0160","https://access.redhat.com/errata/RHSA-2020:0161"],"products":["canonical:ubuntu_linux","debian:debian_linux","netty:netty","redhat:jboss_enterprise_application_platform"],"source":"nvd","synced_at":"2026-10-19T20:59:10.855360465+00:00"},"epss":{"cve":"CVE-2019-16869","score":0.08645,"percentile":0.95074,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-p979-4mfw-53vg","url":"https://osv.dev/vulnerability/GHSA-p979-4mfw-53vg","summary":"HTTP Request Smuggling in Netty","modified":"2026-06-29T15:46:31.336570451Z","packages":[{"ecosystem":"Maven","name":"io.netty:netty-all","purl":"pkg:maven/io.netty/netty-all","ranges":[">=4.0.0.Beta1 <4.1.42.Final"],"fixed":["4.1.42.Final"]},{"ecosystem":"Maven","name":"org.jboss.netty:netty","purl":"pkg:maven/org.jboss.netty/netty","ranges":["<=3.2.9.Final"],"fixed":[]},{"ecosystem":"Maven","name":"io.netty:netty","purl":"pkg:maven/io.netty/netty","ranges":[">=3.3.0.Final <=4.0.0.Alpha8"],"fixed":[]}]}],"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."]}