Request Smuggling Vulnerability in Pingora

{
  "id": "9048179189aad72ff4cf8ce298df73b0fb3f6a971d01106851cc29989fdde019",
  "url": "https://osv.dev/vulnerability/CVE-2025-4366",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Request Smuggling Vulnerability in Pingora",
    "summary": "A request smuggling vulnerability identified within Pingora’s proxying framework, pingora-proxy, allows malicious HTTP requests to be injected via manipulated request bodies on cache HITs, leading to unauthorized request execution and potential cache poisoning. Fixed in: https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff Impact: The issue could lead to request smuggling in cases where Pingora’s proxying framework, pingora-proxy, is used for caching allowing an attacker to manipulate headers and URLs in subsequent requests made on the same HTTP/1.1 connection.",
    "evidence": "osv:CVE-2025-4366",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-4366",
      "aliases": [
        "CVE-2025-4366",
        "GHSA-93c7-7xqw-w357",
        "RUSTSEC-2025-0037"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cloudflare/pingora",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "bd6a74b74675414a3e5d663f58664cd9a4a4b087"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.5.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:cloudflare:pingora:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.4.0",
            "0.3.0",
            "0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-4366.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.950905744Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/4xxx/CVE-2025-4366.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-4366",
        "https://github.com/cloudflare/pingora"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-444"
        ],
        "cna_assigner": "cloudflare",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/4xxx/CVE-2025-4366.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-4366",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496637,
  "published_at": "2025-05-22T15:50:20.789+00:00"
}