Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection

{
  "id": "30c80cbc06e25b4dba0a1509ccf97c05683082f65fbc9b8ed50aa822f931493c",
  "url": "https://osv.dev/vulnerability/CVE-2026-67182",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection",
    "summary": "Rouille 0.3.3 through 3.6.2 contains an HTTP request smuggling vulnerability that allows remote attackers to bypass access controls by injecting bare line feed characters (0x0A) into client-supplied request header values that are copied verbatim to upstream connections without validation. Attackers can craft a header value containing a complete additional HTTP request that is interpreted as a separate request by backends such as Go net/http and Python http.server, causing the backend to process a smuggled request with attacker-chosen method, path, and headers that bypasses the rouille handler's access control logic.",
    "evidence": "osv:CVE-2026-67182",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-67182",
      "aliases": [
        "CVE-2026-67182"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tomaka/rouille",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "536fa0eacaeef93168f3378a0296e3f99da7b3af"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.3.3"
                      },
                      {
                        "last_affected": "3.6.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.6.2",
            "v3.6.1",
            "v3.6.0",
            "v3.5.0",
            "v3.4.0",
            "v3.3.1",
            "v3.3.0",
            "v3.2.1",
            "v3.2.0",
            "v3.1.1",
            "v3.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67182.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.049686669Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67182.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67182",
        "https://www.vulncheck.com/advisories/rouille-http-request-smuggling-via-proxy-header-injection",
        "https://github.com/tomaka/rouille",
        "https://github.com/theopaid/HTTP-Request-Smuggling-Enables-Front-End-Access-Control-Bypass-rouille-"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-444"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67182.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67182",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504438,
  "published_at": "2026-07-28T16:18:08.55+00:00"
}