{"id":"CVE-2023-25725","details":"HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka \"request smuggling.\" The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29, and 2.0.31.","aliases":["BIT-haproxy-2023-25725"],"modified":"2026-04-10T04:56:05.904114Z","published":"2023-02-14T19:15:11.530Z","related":["ALSA-2023:1696","CGA-7rph-rcj7-rh7v","SUSE-FU-2023:2117-1","SUSE-FU-2023:2119-1","SUSE-SU-2023:0411-1","SUSE-SU-2023:0412-1","SUSE-SU-2023:0413-1","openSUSE-SU-2024:12686-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPTJQHKUEU2PQ7RWFUYAFLAD4STEIKHU/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JM5NCIBTHYDTLPY2UNC4HO2VAHHE6CJG/"},{"type":"WEB","url":"https://www.haproxy.org/"},{"type":"WEB","url":"https://git.haproxy.org/?p=haproxy-2.7.git%3Ba=commit%3Bh=a0e561ad7f29ed50c473f5a9da664267b60d1112"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2023/02/msg00012.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5348"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.haproxy.org/haproxy-2.0.git","events":[{"introduced":"0"},{"fixed":"c8b1c15af1934dcdf260312d8e8906fff2c13427"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"2.0.31"}]}},{"type":"GIT","repo":"https://git.haproxy.org/haproxy-2.2.git","events":[{"introduced":"e54b43af1ec9dc656c04b09118583cb3c2ce56fa"},{"fixed":"c5b927c8f535cd3ae206285b2a5181e056f91821"}],"database_specific":{"versions":[{"introduced":"2.1.0"},{"fixed":"2.2.29"}]}},{"type":"GIT","repo":"https://git.haproxy.org/haproxy-2.4.git","events":[{"introduced":"1c0a722a83e7c45456a2b82c15889ab9ab5c4948"},{"fixed":"f8e3218e2a30b1d08ee9caa5c7058e4f0b4c99d7"}],"database_specific":{"versions":[{"introduced":"2.3.0"},{"fixed":"2.4.22"}]}},{"type":"GIT","repo":"https://github.com/haproxy/haproxy","events":[{"introduced":"f2e0833f16aa8c09e1c7001ff55aac4f13c643b7"},{"fixed":"35dc13f224fa3e54814f442a7f63cba642c0be53"},{"introduced":"a1efc048bf8a5e14466dbe7317e73117e8d66176"},{"fixed":"e979796584266caca16250c64cec65d5ec6ff33c"},{"introduced":"437fd289f2e32e56498d2d4da63852d483f284ef"},{"fixed":"87e95d38a9b9b69462569cc75fd1687b3605be7b"}],"database_specific":{"versions":[{"introduced":"2.5.0"},{"fixed":"2.5.12"},{"introduced":"2.6.0"},{"fixed":"2.6.9"},{"introduced":"2.7.0"},{"fixed":"2.7.3"}]}}],"versions":["v1.0.0","v1.0.1","v1.0.2","v1.1.0","v1.1.1","v1.1.10","v1.1.11","v1.1.12","v1.1.13","v1.1.14","v1.1.15","v1.1.16","v1.1.17","v1.1.18","v1.1.19","v1.1.2","v1.1.20","v1.1.21","v1.1.22","v1.1.23","v1.1.24","v1.1.25","v1.1.26","v1.1.27","v1.1.3","v1.1.4","v1.1.5","v1.1.6","v1.1.7","v1.1.8","v1.1.9","v1.2.0","v1.2.1","v1.2.1-pre1","v1.2.1-pre2","v1.2.1-pre3","v1.2.10","v1.2.10.1","v1.2.11","v1.2.11.1","v1.2.12","v1.2.13","v1.2.13.1","v1.2.14","v1.2.2","v1.2.3","v1.2.4","v1.2.5","v1.2.5-pre1","v1.2.5-pre2","v1.2.5-pre3","v1.2.5-pre4","v1.2.5.1","v1.2.5.2","v1.2.6","v1.2.6-pre4","v1.2.6-pre5","v1.2.7","v1.2.7.1","v1.2.7rc","v1.2.8","v1.2.9","v1.3.0","v1.3.1","v1.3.10","v1.3.10.1","v1.3.10.2","v1.3.11","v1.3.11.1","v1.3.11.2","v1.3.11.3","v1.3.11.4","v1.3.12","v1.3.13","v1.3.14","v1.3.15","v1.3.16","v1.3.16-rc1","v1.3.16-rc2","v1.3.17","v1.3.18","v1.3.2","v1.3.3","v1.3.4","v1.3.5","v1.3.6","v1.3.6.1","v1.3.7","v1.3.8","v1.3.8.1","v1.3.8.2","v1.3.9","v1.4-dev0","v1.4-dev1","v1.4-dev2","v1.4-dev3","v1.4-dev4","v1.4-dev5","v1.4-dev6","v1.4-dev7","v1.4-dev8","v1.4-rc1","v1.4.0","v1.4.1","v1.4.2","v1.4.3","v1.4.4","v1.4.5","v1.4.6","v1.5-dev10","v1.5-dev12","v1.5-dev13","v1.5-dev14","v1.5-dev15","v1.5-dev16","v1.5-dev17","v1.5-dev18","v1.5-dev19","v1.5-dev20","v1.5-dev21","v1.5-dev22","v1.5-dev23","v1.5-dev24","v1.5-dev25","v1.5-dev26","v1.5-dev8","v1.5-dev9","v1.5.0","v1.6-dev0","v1.6-dev1","v1.6-dev2","v1.6-dev3","v1.6-dev4","v1.6-dev5","v1.6-dev6","v1.6-dev7","v1.6.0","v1.7-dev0","v1.7-dev1","v1.7-dev2","v1.7-dev3","v1.7-dev4","v1.7-dev5","v1.7-dev6","v1.7.0","v1.8-dev0","v1.8-dev1","v1.8-dev2","v1.8-dev3","v1.8-rc1","v1.8-rc2","v1.8-rc3","v1.8-rc4","v1.8.0","v1.9-dev0","v1.9-dev1","v1.9-dev10","v1.9-dev11","v1.9-dev2","v1.9-dev3","v1.9-dev4","v1.9-dev5","v1.9-dev6","v1.9-dev7","v1.9-dev8","v1.9-dev9","v1.9.0","v2.0-dev0","v2.0-dev1","v2.0-dev2","v2.0-dev3","v2.0-dev4","v2.0-dev5","v2.0-dev6","v2.0-dev7","v2.0.0","v2.0.1","v2.0.10","v2.0.11","v2.0.12","v2.0.13","v2.0.14","v2.0.15","v2.0.16","v2.0.17","v2.0.18","v2.0.19","v2.0.2","v2.0.20","v2.0.21","v2.0.22","v2.0.23","v2.0.24","v2.0.25","v2.0.26","v2.0.27","v2.0.28","v2.0.29","v2.0.3","v2.0.30","v2.0.4","v2.0.5","v2.0.6","v2.0.7","v2.0.8","v2.0.9","v2.1.0","v2.2-dev0","v2.2-dev1","v2.2-dev10","v2.2-dev11","v2.2-dev12","v2.2-dev2","v2.2-dev3","v2.2-dev4","v2.2-dev5","v2.2-dev6","v2.2-dev7","v2.2-dev8","v2.2-dev9","v2.2.0","v2.2.1","v2.2.10","v2.2.11","v2.2.12","v2.2.13","v2.2.14","v2.2.15","v2.2.16","v2.2.17","v2.2.18","v2.2.19","v2.2.2","v2.2.20","v2.2.21","v2.2.22","v2.2.23","v2.2.24","v2.2.25","v2.2.26","v2.2.27","v2.2.28","v2.2.3","v2.2.4","v2.2.5","v2.2.6","v2.2.7","v2.2.8","v2.2.9","v2.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