{"id":"CVE-2026-55202","aliases":["DEBIAN-CVE-2026-55202","EUVD-2026-37786","GHSA-f33v-8wrm-6584","UBUNTU-CVE-2026-55202","openSUSE-SU-2026:11060-1","openSUSE-SU-2026:22133-1"],"status":"published","title":"Tinyproxy - Stathost Detection Bypass via Host Header Manipulation","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","severity":{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00381,"percentile":0.32466,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-290"],"published":"2026-06-17T19:13:45Z","modified":"2026-11-09T02:47:23Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.1-2.1","1.11.1-2.1+deb12u1","1.11.1-3","1.11.1-4","1.11.2-1","1.11.2-1~bpo12+1","1.11.3-1","1.11.3-1~bpo13+1"]},{"source":"osv","ecosystem":"Debian:13","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.2-1","1.11.3-1","1.11.3-1~bpo13+1"]},{"source":"osv","ecosystem":"Debian:14","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.2-1","1.11.3-1","1.11.3-1~bpo13+1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-3ubuntu1","1.8.3-3ubuntu14.04.1~esm1","1.8.3-3ubuntu14.04.1~esm2","1.8.3-3ubuntu14.04.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-3ubuntu1","1.8.3-3ubuntu16.04.1~esm1","1.8.3-3ubuntu16.04.1~esm2","1.8.3-3ubuntu16.04.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.4-2","1.8.4-3","1.8.4-5","1.8.4-5ubuntu0.1~esm1","1.8.4-5ubuntu0.1~esm2","1.8.4-5ubuntu0.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-2","1.10.0-4","1.10.0-4ubuntu0.1","1.10.0-4ubuntu0.2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-5","1.11.0-1","1.11.0-1ubuntu0.1~esm1","1.11.0-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.1-2.1","1.11.1-3","1.11.1-3ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.2-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.3-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.2-1","1.11.2-1build1","1.11.3-1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.3-3.1"}]}],"bundled":3},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"tinyproxy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.3-bp160.2.1"}]}],"bundled":3}],"products":[{"vendor":"tinyproxy","product":"tinyproxy"},{"vendor":"tinyproxy project","product":"tinyproxy"}],"references":[{"url":"https://github.com/tinyproxy/tinyproxy/pull/606","tags":["issue-tracking","patch","fix","report"]},{"url":"https://github.com/tinyproxy/tinyproxy/commit/09312a185ae25cc486b4ff5987638a7917a48bce","tags":["patch","fix"]},{"url":"https://www.vulncheck.com/advisories/tinyproxy-stathost-detection-bypass-via-host-header-manipulation","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55202","tags":["advisory"]},{"url":"https://www.vulncheck.com/advisories/evil-winrm-path-traversal-in-download-dir-function"},{"url":"https://github.com/advisories/GHSA-f33v-8wrm-6584"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55202.json","tags":["advisory"]},{"url":"https://github.com/tinyproxy/tinyproxy","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-55202","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-55202","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55202","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-54387","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-54388","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-55202","tags":["web"]},{"url":"https://bugzilla.suse.com/1268474","tags":["report"]},{"url":"https://bugzilla.suse.com/1268475","tags":["report"]},{"url":"https://bugzilla.suse.com/1268476","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-55202","title":"Tinyproxy - Stathost Detection Bypass via Host Header Manipulation","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","status":"published","published":"2026-06-17T19:13:45.383Z","modified":"2026-11-08T14:05:23.113Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-290"],"updated_at":"2026-11-08T15:43:33.322657Z"}],"euvd":[{"id":"EUVD-2026-37786","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","status":"published","published":"2026-06-17T19:13:45Z","modified":"2026-11-08T14:05:23Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-08T15:13:08.252361Z"}],"ghsa":[{"id":"GHSA-f33v-8wrm-6584","title":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header...","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","status":"published","published":"2026-06-17T21:34:39Z","modified":"2026-10-29T21:31:31Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T15:14:41.240878Z"}],"nvd":[{"id":"CVE-2026-55202","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","status":"published","published":"2026-06-17T20:17:29.25Z","modified":"2026-10-29T21:17:24.21Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T14:12:24.544761Z"}],"osv":[{"id":"CVE-2026-55202","title":"Tinyproxy - Stathost Detection Bypass via Host Header Manipulation","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","status":"published","published":"2026-06-17T19:13:45.383Z","modified":"2026-11-09T07:04:15.172894338Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-290"],"updated_at":"2026-11-09T03:16:17.543303Z"},{"id":"DEBIAN-CVE-2026-55202","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","status":"published","published":"2026-06-17T20:17:29.25Z","modified":"2026-10-30T09:49:03.24788205Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:45:57.236551Z"},{"id":"UBUNTU-CVE-2026-55202","description":"Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.","status":"published","published":"2026-06-17T20:17:00Z","modified":"2026-10-17T13:00:26.970845651Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"high"},{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:56:41.382716Z"},{"id":"openSUSE-SU-2026:11060-1","title":"tinyproxy-1.11.3-3.1 on GA media","description":"These are all security issues fixed in the tinyproxy-1.11.3-3.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-06-18T00:00:00Z","modified":"2026-06-19T08:15:05.714639953Z","updated_at":"2026-11-02T16:58:38.95195Z"},{"id":"openSUSE-SU-2026:22133-1","title":"Security update for tinyproxy","description":"This update for tinyproxy fixes the following issues:\n\nChanges in tinyproxy:\n\n- Fixed failure to reconcile conflicting Content-Length and Transfer-Encoding [boo#1268474, CVE-2026-54387]\n- Fixed failure to reject requests containing multiple Content-Length headers with differing values [boo#1268475, CVE-2026-54388]\n- Fixed failure to properly validate the Host header during stathost detection [boo#1268476, CVE-2026-55202]\n","status":"published","published":"2026-10-19T16:26:02Z","modified":"2026-10-20T19:15:03.958123867Z","updated_at":"2026-11-02T16:58:42.426393Z"}]}}