GHSA-vhj5-x93p-67jw: Actix web lab Actix-web-lab Has Host Header Poisoning Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vhj5-x93p-67jw",
  "modified" : "2026-03-11T00:29:17Z",
  "published" : "2026-03-11T00:29:17Z",
  "aliases" : [ ],
  "summary" : "actix-web-lab has host header poisoning in redirect middleware can generate attacker-controlled absolute redirects",
  "details" : "### 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "actix-web-lab"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.26.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.25.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/robjtede/actix-web-lab/security/advisories/GHSA-vhj5-x93p-67jw"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/robjtede/actix-web-lab/pull/292"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/robjtede/actix-web-lab/commit/142c28b82eb59b67445a859a2a9b75e01a9964ee"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/robjtede/actix-web-lab"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-11T00:29:17Z",
    "nvd_published_at" : null
  }
}