CVE-2019-19330

The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.

• CWE-74

• https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=ac198b92d461515551b95daae20954b3053ce87e
• https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=146f53ae7e97dbfe496d0445c2802dd0a30b0878
• https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=54f53ef7ce4102be596130b44c768d1818570344
• https://seclists.org/bugtraq/2019/Nov/45Mailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202004-01
• https://tools.ietf.org/html/rfc7540#section-10.3Third Party Advisory
• https://usn.ubuntu.com/4212-1/Third Party Advisory
• https://www.debian.org/security/2019/dsa-4577Third Party Advisory
• https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=ac198b92d461515551b95daae20954b3053ce87e
• https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=146f53ae7e97dbfe496d0445c2802dd0a30b0878
• https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=54f53ef7ce4102be596130b44c768d1818570344
• https://seclists.org/bugtraq/2019/Nov/45Mailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202004-01
• https://tools.ietf.org/html/rfc7540#section-10.3Third Party Advisory
• https://usn.ubuntu.com/4212-1/Third Party Advisory
• https://www.debian.org/security/2019/dsa-4577Third Party Advisory

Published

Nov 27, 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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