{"id":"CVE-2026-88829","aliases":["AZL-109779","BELL-CVE-2026-88829","DEBIAN-CVE-2026-88829","EUVD-2026-100952","GHSA-89f7-8rmh-f5q2","UBUNTU-CVE-2026-88829","openSUSE-SU-2026:12376-1"],"status":"published","title":"Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","severity":{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00261,"percentile":0.17974,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-444"],"published":"2026-10-14T10:00:42Z","modified":"2026-11-05T05:40:51Z","affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.36.1-28"}]}]},{"source":"osv","ecosystem":"Alpaquita:23","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.35.0-r29"}]}]},{"source":"osv","ecosystem":"Alpaquita:25","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.37.0-r20"}]}]},{"source":"osv","ecosystem":"Alpaquita:stream","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.36.1-r1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.35.0-4","1:1.35.0-4+deb12u1","1:1.36.0-1~exp1","1:1.36.1-1","1:1.36.1-2","1:1.36.1-3","1:1.36.1-3.1","1:1.36.1-4","1:1.36.1-5","1:1.36.1-6","1:1.36.1-6~exp.1","1:1.36.1-7","1:1.36.1-8","1:1.36.1-9","1:1.37.0-1","1:1.37.0-10","1:1.37.0-10.1","1:1.37.0-2","1:1.37.0-3","1:1.37.0-4","1:1.37.0-5","1:1.37.0-6","1:1.37.0-7","1:1.37.0-8","1:1.37.0-9","1:1.38.0-1","1:1.38.0-2","1:1.38.0-3"]},{"source":"osv","ecosystem":"Debian:13","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-10","1:1.37.0-10.1","1:1.37.0-6","1:1.37.0-7","1:1.37.0-8","1:1.37.0-9","1:1.38.0-1","1:1.38.0-2","1:1.38.0-3"]},{"source":"osv","ecosystem":"Debian:14","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-10","1:1.37.0-10.1","1:1.37.0-6","1:1.37.0-7","1:1.37.0-8","1:1.37.0-9","1:1.38.0-1","1:1.38.0-2","1:1.38.0-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.20.0-8.1ubuntu1","1:1.20.0-9ubuntu1","1:1.20.0-9ubuntu2","1:1.21.0-1ubuntu1","1:1.21.0-1ubuntu1.4","1:1.21.0-1ubuntu1.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.22.0-15ubuntu1","1:1.22.0-15ubuntu1.4","1:1.22.0-15ubuntu1.4+esm1","1:1.22.0-15ubuntu1.4+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.22.0-19ubuntu2","1:1.27.2-1ubuntu3","1:1.27.2-1ubuntu4","1:1.27.2-2ubuntu2","1:1.27.2-2ubuntu3","1:1.27.2-2ubuntu3.1","1:1.27.2-2ubuntu3.2","1:1.27.2-2ubuntu3.3","1:1.27.2-2ubuntu3.4","1:1.27.2-2ubuntu3.4+esm1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.30.1-4ubuntu4","1:1.30.1-4ubuntu5","1:1.30.1-4ubuntu6","1:1.30.1-4ubuntu6.1","1:1.30.1-4ubuntu6.2","1:1.30.1-4ubuntu6.3","1:1.30.1-4ubuntu6.4","1:1.30.1-4ubuntu6.5"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.30.1-6ubuntu3","1:1.30.1-7ubuntu1","1:1.30.1-7ubuntu2","1:1.30.1-7ubuntu3","1:1.30.1-7ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.36.1-3ubuntu1","1:1.36.1-6ubuntu1","1:1.36.1-6ubuntu3","1:1.36.1-6ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-7ubuntu1","1:1.37.0-10.1ubuntu2","1:1.37.0-10.1ubuntu3","1:1.38.0-3ubuntu1","1:1.38.0-3ubuntu3","1:1.38.0-3ubuntu4"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.37.0-4ubuntu1","1:1.37.0-7ubuntu1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"busybox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.38.0-4.1"}]}],"bundled":8}],"products":[{"vendor":"red hat","product":"red hat hardened images"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-88829","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531343","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88829","tags":["web"]},{"url":"https://github.com/advisories/GHSA-89f7-8rmh-f5q2"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-88829","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-88829","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-88829","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88829","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2024-58251","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-108119","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88829","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88833","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88834","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88842","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-90954","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-92205","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-88829","title":"Busybox: busybox: http request smuggling via pipelined requests in httpd reverse proxy","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","status":"published","published":"2026-10-14T10:00:42.946Z","modified":"2026-11-11T20:27:47.355Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-11T21:33:02.961334Z"}],"euvd":[{"id":"EUVD-2026-100952","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","status":"published","published":"2026-10-14T10:00:42Z","modified":"2026-11-11T20:27:47Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"updated_at":"2026-11-11T22:30:45.298198Z"}],"ghsa":[{"id":"GHSA-89f7-8rmh-f5q2","title":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to...","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","status":"published","published":"2026-10-14T12:31:32Z","modified":"2026-10-14T12:31:41Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:13:24.188405Z"}],"nvd":[{"id":"CVE-2026-88829","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","status":"published","published":"2026-10-14T10:17:57.077Z","modified":"2026-10-15T16:33:26.29Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:12:58.99337Z"}],"osv":[{"id":"BELL-CVE-2026-88829","status":"published","published":"2026-10-20T06:09:06.862775Z","modified":"2026-10-24T07:15:22.182956813Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:26.630331Z"},{"id":"DEBIAN-CVE-2026-88829","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","status":"published","published":"2026-10-14T10:17:57.077Z","modified":"2026-10-16T09:47:32.391641331Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"updated_at":"2026-11-02T15:46:05.506112Z"},{"id":"UBUNTU-CVE-2026-88829","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","status":"published","published":"2026-10-14T10:17:00Z","modified":"2026-10-28T17:43:56Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"updated_at":"2026-11-02T16:57:24.828975Z"},{"id":"AZL-109779","title":"CVE-2026-88829 affecting package busybox 1.36.1-28","description":"A flaw was found in BusyBox httpd's reverse proxy feature. When the proxy is configured to forward requests matching a URL prefix to a backend server, only the first HTTP request on a TCP connection has its path rewritten. An attacker can send a pipelined second request that is relayed verbatim to the backend, bypassing the configured path restrictions. This allows accessing arbitrary paths on the backend server that were not intended to be exposed through the proxy.","status":"published","published":"2026-10-14T10:17:57Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:18.42484Z"},{"id":"openSUSE-SU-2026:12376-1","title":"busybox-1.38.0-4.1 on GA media","description":"These are all security issues fixed in the busybox-1.38.0-4.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-01T00:00:00Z","modified":"2026-11-02T12:15:05.284080191Z","updated_at":"2026-11-02T16:58:41.463445Z"}]}}