{"id":"CVE-2026-110354","aliases":["AZL-111017","DEBIAN-CVE-2026-110354","EUVD-2026-108000","GHSA-vqpp-w68q-p3f5","UBUNTU-CVE-2026-110354","USN-8972-1","openSUSE-SU-2026:12431-1"],"status":"published","title":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service ...","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00807,"percentile":0.57314,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-835"],"published":"2026-10-22T02:46:38Z","modified":"2026-11-06T17:27:16Z","fixes":[{"ecosystem":"Azure Linux:3","package":"haproxy","fixed_in":["2.9.11-9"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"haproxy","fixed_in":["2.6.12-1+deb12u4"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"haproxy","fixed_in":["3.0.11-1+deb13u4"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"haproxy","fixed_in":["3.2.26-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"haproxy","fixed_in":["2.4.30-0ubuntu0.22.04.3"],"sources":["osv"]},{"ecosystem":"Ubuntu:24.04:LTS","package":"haproxy","fixed_in":["2.8.30-0ubuntu0.24.04.2"],"sources":["osv"]},{"ecosystem":"Ubuntu:26.10","package":"haproxy","fixed_in":["3.4.2-1ubuntu4.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:26.04:LTS","package":"haproxy","fixed_in":["3.2.25-0ubuntu0.26.04.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.11-9"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.12-1+deb12u4"}]}],"versions":["2.6.12-1","2.6.12-1+deb12u1","2.6.12-1+deb12u2","2.6.12-1+deb12u3"]},{"source":"osv","ecosystem":"Debian:13","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.11-1+deb13u4"}]}],"versions":["3.0.11-1","3.0.11-1+deb13u1","3.0.11-1+deb13u2","3.0.11-1+deb13u3"]},{"source":"osv","ecosystem":"Debian:14","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.26-1"}]}],"versions":["3.0.11-1","3.1.0-1","3.1.0-2","3.1.1-1","3.1.2-1","3.1.3-1","3.1.5-1","3.1.6-1","3.1.7-1","3.2.0-1","3.2.1-1","3.2.10-1","3.2.11-1","3.2.11-2","3.2.12-1","3.2.13-1","3.2.14-1","3.2.15-1","3.2.16-1","3.2.17-1","3.2.18-1","3.2.19-1","3.2.20-1","3.2.21-1","3.2.22-1","3.2.23-1","3.2.24-1","3.2.25-1","3.2.3-1","3.2.3-2","3.2.4-1","3.2.5-1","3.2.5-2","3.2.6-1","3.2.7-1","3.2.8-1","3.2.9-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.14-1","1.5.15-1","1.6.2-1","1.6.2-2","1.6.2-2ubuntu1","1.6.2-2ubuntu3","1.6.3-1","1.6.3-1ubuntu0.1","1.6.3-1ubuntu0.2","1.6.3-1ubuntu0.3","1.6.3-1ubuntu0.3+esm1","1.6.3-1ubuntu0.3+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.9-1ubuntu1","1.7.9-1ubuntu2","1.8.4-1","1.8.7-1","1.8.8-1","1.8.8-1ubuntu0.1","1.8.8-1ubuntu0.2","1.8.8-1ubuntu0.3","1.8.8-1ubuntu0.4","1.8.8-1ubuntu0.6","1.8.8-1ubuntu0.7","1.8.8-1ubuntu0.8","1.8.8-1ubuntu0.9","1.8.8-1ubuntu0.10","1.8.8-1ubuntu0.11","1.8.8-1ubuntu0.13","1.8.8-1ubuntu0.13+esm2","1.8.8-1ubuntu0.13+esm3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.5-1","2.0.8-1","2.0.9-1","2.0.10-1","2.0.10-1ubuntu1","2.0.11-1ubuntu1","2.0.12-1ubuntu2","2.0.13-1ubuntu2","2.0.13-2","2.0.13-2ubuntu0.1","2.0.13-2ubuntu0.2","2.0.13-2ubuntu0.3","2.0.13-2ubuntu0.5","2.0.29-0ubuntu1","2.0.29-0ubuntu1.1","2.0.29-0ubuntu1.3","2.0.31-0ubuntu0.1","2.0.31-0ubuntu0.2","2.0.31-0ubuntu0.3","2.0.33-0ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.30-0ubuntu0.22.04.3"}]}],"versions":["2.2.9-2ubuntu2","2.4.8-1","2.4.8-2ubuntu3","2.4.11-1ubuntu1","2.4.12-1ubuntu1","2.4.12-1ubuntu2","2.4.13-1ubuntu1","2.4.14-1ubuntu1","2.4.18-0ubuntu1","2.4.18-0ubuntu1.1","2.4.18-0ubuntu1.2","2.4.18-0ubuntu1.3","2.4.22-0ubuntu0.22.04.1","2.4.22-0ubuntu0.22.04.2","2.4.22-0ubuntu0.22.04.3","2.4.24-0ubuntu0.22.04.1","2.4.24-0ubuntu0.22.04.2","2.4.24-0ubuntu0.22.04.3","2.4.29-0ubuntu0.22.04.1","2.4.30-0ubuntu0.22.04.1","2.4.30-0ubuntu0.22.04.2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.30-0ubuntu0.24.04.2"}]}],"versions":["2.6.15-1ubuntu2","2.8.5-1ubuntu1","2.8.5-1ubuntu2","2.8.5-1ubuntu3","2.8.5-1ubuntu3.1","2.8.5-1ubuntu3.2","2.8.5-1ubuntu3.3","2.8.5-1ubuntu3.4","2.8.15-0ubuntu0.24.04.1","2.8.16-0ubuntu0.24.04.1","2.8.16-0ubuntu0.24.04.2","2.8.16-0ubuntu0.24.04.3","2.8.30-0ubuntu0.24.04.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.2-1ubuntu4.1"}]}],"versions":["3.2.9-1ubuntu2","3.2.9-1ubuntu2.1","3.2.9-1ubuntu3","3.4.2-1ubuntu2","3.4.2-1ubuntu3","3.4.2-1ubuntu4"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.25-0ubuntu0.26.04.2"}]}],"versions":["3.0.10-1ubuntu3","3.2.9-1ubuntu1","3.2.9-1ubuntu2","3.2.9-1ubuntu2.1","3.2.9-1ubuntu2.2","3.2.25-0ubuntu0.26.04.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.30-0ubuntu0.22.04.3"}]}],"versions":["2.2.9-2ubuntu2","2.4.8-1","2.4.8-2ubuntu3","2.4.11-1ubuntu1","2.4.12-1ubuntu1","2.4.12-1ubuntu2","2.4.13-1ubuntu1","2.4.14-1ubuntu1","2.4.18-0ubuntu1","2.4.18-0ubuntu1.1","2.4.18-0ubuntu1.2","2.4.18-0ubuntu1.3","2.4.22-0ubuntu0.22.04.1","2.4.22-0ubuntu0.22.04.2","2.4.22-0ubuntu0.22.04.3","2.4.24-0ubuntu0.22.04.1","2.4.24-0ubuntu0.22.04.2","2.4.24-0ubuntu0.22.04.3","2.4.29-0ubuntu0.22.04.1","2.4.30-0ubuntu0.22.04.1","2.4.30-0ubuntu0.22.04.2"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.30-0ubuntu0.24.04.2"}]}],"versions":["2.6.15-1ubuntu2","2.8.5-1ubuntu1","2.8.5-1ubuntu2","2.8.5-1ubuntu3","2.8.5-1ubuntu3.1","2.8.5-1ubuntu3.2","2.8.5-1ubuntu3.3","2.8.5-1ubuntu3.4","2.8.15-0ubuntu0.24.04.1","2.8.16-0ubuntu0.24.04.1","2.8.16-0ubuntu0.24.04.2","2.8.16-0ubuntu0.24.04.3","2.8.30-0ubuntu0.24.04.1"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.2-1ubuntu4.1"}]}],"versions":["3.2.9-1ubuntu2","3.2.9-1ubuntu2.1","3.2.9-1ubuntu3","3.4.2-1ubuntu2","3.4.2-1ubuntu3","3.4.2-1ubuntu4"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.25-0ubuntu0.26.04.2"}]}],"versions":["3.0.10-1ubuntu3","3.2.9-1ubuntu1","3.2.9-1ubuntu2","3.2.9-1ubuntu2.1","3.2.9-1ubuntu2.2","3.2.25-0ubuntu0.26.04.1"],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"haproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.7+git57.0faeaeda6-2.1"}]}],"bundled":2}],"products":[{"vendor":"haproxy","product":"haproxy"},{"vendor":"haproxy","product":"haproxy enterprise edition"},{"vendor":"haproxy","product":"haproxy kubernetes ingress controller"},{"vendor":"haproxy technologies","product":"haproxy kubernetes ingress controller"},{"vendor":"haproxy technologies","product":"kubernetes ingress controller enterprise"}],"references":[{"url":"https://git.haproxy.org/?p=haproxy.git;a=commit;h=077906da140a35873bf451d7e9f67646c9f37c81","tags":["vendor-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110354","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-vqpp-w68q-p3f5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110354.json","tags":["advisory"]},{"url":"https://git.haproxy.org/git/haproxy.git","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-110354","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-110354","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-110354","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8972-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-110353","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-110353","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-110354","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-110354","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T02:46:38.255Z","modified":"2026-10-22T19:10:34.563Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T13:34:26.24368Z"}],"euvd":[{"id":"EUVD-2026-108000","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T02:46:38Z","modified":"2026-10-22T19:10:34Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:59:34.021826Z"}],"ghsa":[{"id":"GHSA-vqpp-w68q-p3f5","title":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service ...","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T03:33:49Z","modified":"2026-10-22T03:33:57Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T15:14:14.973906Z"}],"nvd":[{"id":"CVE-2026-110354","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T03:16:31.427Z","modified":"2026-10-22T19:17:35.66Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:13:02.371082Z"}],"osv":[{"id":"CVE-2026-110354","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T02:46:38.255Z","modified":"2026-11-06T17:27:16.187243403Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-835"],"updated_at":"2026-11-06T18:04:05.748588Z"},{"id":"DEBIAN-CVE-2026-110354","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T03:16:31.427Z","modified":"2026-10-26T08:00:08.479646238Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:49.824149Z"},{"id":"UBUNTU-CVE-2026-110354","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T03:16:00Z","modified":"2026-11-03T21:18:31.460910669Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T21:43:43.010304Z"},{"id":"AZL-111017","title":"CVE-2026-110354 affecting package haproxy for versions less than 2.9.11-9","description":"HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.","status":"published","published":"2026-10-22T03:16:31Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:18.705965Z"},{"id":"openSUSE-SU-2026:12431-1","title":"haproxy-3.4.7+git57.0faeaeda6-2.1 on GA media","description":"These are all security issues fixed in the haproxy-3.4.7+git57.0faeaeda6-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-05T00:00:00Z","modified":"2026-11-06T17:23:11.696389196Z","updated_at":"2026-11-06T18:05:03.243497Z"},{"id":"USN-8972-1","title":"haproxy vulnerabilities","description":"It was discovered that HAProxy incorrectly handled truncated HTTP/2\nPING frames. A remote attacker could possibly use this issue to cause\nHAProxy to consume excessive CPU resources, leading to a denial of\nservice. (CVE-2026-110353)\n\nIt was discovered that HAProxy incorrectly handled certain HTTP/1.1\nchunked requests. A remote attacker could possibly use this issue to\ncause HAProxy to consume excessive CPU resources, leading to a denial\nof service. (CVE-2026-110354)","status":"published","published":"2026-11-03T14:33:21Z","modified":"2026-11-04T03:43:09.902273887Z","updated_at":"2026-11-04T03:56:18.279609Z"}]}}