{"id":"CVE-2016-1133","aliases":["EUVD-2016-2237","GHSA-mpq7-xv6q-mqgh"],"status":"published","title":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2...","description":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.","severity":{"version":"3.0","score":3.7,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01459,"percentile":0.73711,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2016-01-16T02:00:00Z","modified":"2026-10-20T10:47:30Z","products":[{"vendor":"dena","product":"h2o"}],"references":[{"url":"https://github.com/h2o/h2o/issues/682","tags":["x_refsource_CONFIRM","x_transferred","report"]},{"url":"https://github.com/h2o/h2o/issues/684","tags":["x_refsource_CONFIRM","x_transferred","report"]},{"url":"http://jvndb.jvn.jp/jvndb/JVNDB-2016-000003","tags":["third-party-advisory","x_refsource_JVNDB","x_transferred","Vendor Advisory","advisory"]},{"url":"http://jvn.jp/en/jp/JVN45928828/index.html","tags":["third-party-advisory","x_refsource_JVN","x_transferred","Vendor Advisory","advisory"]},{"url":"https://h2o.examp1e.net/vulnerabilities.html#CVE-2016-1133","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-1133"},{"url":"https://github.com/advisories/GHSA-mpq7-xv6q-mqgh"}],"sources":{"cve":[{"id":"CVE-2016-1133","description":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.","status":"published","published":"2016-01-16T02:00:00Z","modified":"2024-08-05T22:48:13.358Z","updated_at":"2026-11-02T14:33:35.488991Z"}],"euvd":[{"id":"EUVD-2016-2237","description":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.","status":"published","published":"2016-01-16T02:00:00Z","modified":"2024-08-05T22:48:13Z","updated_at":"2026-11-03T02:22:58.402739Z"}],"ghsa":[{"id":"GHSA-mpq7-xv6q-mqgh","title":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2...","description":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.","status":"published","published":"2022-05-13T01:10:46Z","modified":"2023-02-01T05:03:39Z","cvss":[{"version":"3.0","score":3.7,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T14:50:05.685198Z"}],"nvd":[{"id":"CVE-2016-1133","description":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.","status":"published","published":"2016-01-16T05:59:03.253Z","modified":"2026-06-17T00:41:21.3Z","cvss":[{"version":"3.0","score":3.7,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:03:21.143462Z"}],"osv":[{"id":"CVE-2016-1133","description":"CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.","status":"published","published":"2016-01-16T05:59:03.253Z","modified":"2026-10-20T10:47:30.257224585Z","cvss":[{"version":"3.0","score":3.7,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:44:01.531338Z"}]}}