CVE-2019-16254

Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.

• CWE-74

• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html
• https://hackerone.com/reports/331984Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/11/msg00025.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html
• https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
• https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
• https://seclists.org/bugtraq/2019/Dec/31
• https://seclists.org/bugtraq/2019/Dec/32
• https://security.gentoo.org/glsa/202003-06
• https://www.debian.org/security/2019/dsa-4586
• https://www.debian.org/security/2019/dsa-4587
• https://www.oracle.com/security-alerts/cpujan2020.html
• https://www.ruby-lang.org/ja/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254/Vendor Advisory
• https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released/Vendor Advisory
• https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released/Vendor Advisory
• https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released/Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html
• https://hackerone.com/reports/331984Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/11/msg00025.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html
• https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
• https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
• https://seclists.org/bugtraq/2019/Dec/31
• https://seclists.org/bugtraq/2019/Dec/32
• https://security.gentoo.org/glsa/202003-06
• https://www.debian.org/security/2019/dsa-4586
• https://www.debian.org/security/2019/dsa-4587
• https://www.oracle.com/security-alerts/cpujan2020.html
• https://www.ruby-lang.org/ja/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254/Vendor Advisory
• https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released/Vendor Advisory
• https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released/Vendor Advisory
• https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released/Vendor Advisory

Published

Nov 26, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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