{"id":"UBUNTU-CVE-2018-1000164","details":"gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in \"process_headers\" function in \"gunicorn/http/wsgi.py\" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.","modified":"2026-02-04T02:52:11.233414Z","published":"2018-04-18T00:00:00Z","related":["USN-4022-1"],"upstream":["CVE-2018-1000164"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-1000164"},{"type":"REPORT","url":"https://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4022-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-1000164"}],"affected":[{"package":{"name":"gunicorn","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/gunicorn@17.5-2ubuntu0.1~esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"17.5-2ubuntu0.1~esm1"}]}],"versions":["17.5-2","17.5-2build1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"gunicorn","binary_version":"17.5-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-1000164.json"}},{"package":{"name":"gunicorn","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/gunicorn@19.4.5-1ubuntu1.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"19.4.5-1ubuntu1.1"}]}],"versions":["19.0-8ubuntu1","19.4.1-1ubuntu1","19.4.5-1ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"gunicorn","binary_version":"19.4.5-1ubuntu1.1"},{"binary_name":"gunicorn-examples","binary_version":"19.4.5-1ubuntu1.1"},{"binary_name":"gunicorn3","binary_version":"19.4.5-1ubuntu1.1"},{"binary_name":"python-gunicorn","binary_version":"19.4.5-1ubuntu1.1"},{"binary_version":"19.4.5-1ubuntu1.1","binary_name":"python3-gunicorn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-1000164.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}