{"cve":{"cve_id":"CVE-2026-77281","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00491,"epss_percentile":0.40765,"epss_as_of":"2026-10-15","description":"Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, three configuration-dependent weaknesses affect the handler and placeholder layer. In modules/caddyhttp/rewrite/rewrite.go, Rewrite.Rewrite() can pass attacker-controlled replacement bytes through buildQueryString for a second placeholder expansion when a rewrite URI ends with a literal question mark, allowing injected environment or request-variable placeholders to disclose data and, when the file provider is registered, allowing injected file placeholders to disclose readable files. The  issue is fixed in version 2.11.4.","published_at":"2026-09-17T21:04:58.400000Z","last_modified_at":"2026-09-24T21:16:28.120000Z","cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-94","CWE-178","CWE-770"],"nvd_references":["https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9","https://github.com/caddyserver/caddy/pull/7761","https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb","https://github.com/caddyserver/caddy/releases/tag/v2.11.4"],"vuln_status":"Awaiting Analysis","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-09-18T00:03:42.160051Z","updated_at":"2026-09-26T06:43:31.690671Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"caddyserver","vendor_name":"caddyserver","product_slug":"caddy","product_name":"caddy","version_start":"< 2.11.4","version_start_inclusive":true,"version_end":"< 2.11.4","version_end_inclusive":true,"cpe23_uri":"cve5:caddyserver:caddy:< 2.11.4:< 2.11.4"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/caddyserver/caddy/pull/7761","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/caddyserver/caddy/releases/tag/v2.11.4","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-09-17T21:04:58.400000Z","label":"CVE published","source":null}]}