{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-55202: Tinyproxy - Stathost Detection Bypass via Host Header Manipulation","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-55202","status":"final","version":"1","initial_release_date":"2026-06-17T19:13:45.383Z","current_release_date":"2026-06-17T19:45:15.614Z","revision_history":[{"date":"2026-06-17T19:13:45.383Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-55202 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-55202"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-55202"},{"category":"external","summary":"Pull Request","url":"https://github.com/tinyproxy/tinyproxy/pull/606"},{"category":"external","summary":"Patch Commit","url":"https://github.com/tinyproxy/tinyproxy/commit/09312a185ae25cc486b4ff5987638a7917a48bce"},{"category":"external","summary":"vulncheck.com","url":"https://www.vulncheck.com/advisories/evil-winrm-path-traversal-in-download-dir-function"}]},"product_tree":{"branches":[{"category":"vendor","name":"tinyproxy","branches":[{"category":"product_name","name":"tinyproxy","branches":[{"category":"product_version_range","name":"<=1.11.3","product":{"name":"tinyproxy tinyproxy <=1.11.3","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:tinyproxy:tinyproxy:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"09312a185ae25cc486b4ff5987638a7917a48bce","product":{"name":"tinyproxy tinyproxy 09312a185ae25cc486b4ff5987638a7917a48bce","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:tinyproxy:tinyproxy:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-55202","title":"Tinyproxy - Stathost Detection Bypass via Host Header Manipulation","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"],"fixed":["CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":8.8,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 09312a185ae25cc486b4ff5987638a7917a48bce.","product_ids":["CSAFPID-1"],"url":"https://github.com/tinyproxy/tinyproxy/commit/09312a185ae25cc486b4ff5987638a7917a48bce"}]}]}