{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "0.12.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "212b1c45852fef2093dc1374875a9393c55eb4b9"
            }
          ],
          "repo": "https://github.com/tiny-http/tiny-http",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-444"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66752.json"
  },
  "details": "tiny-http through 0.12.0 contains an HTTP request smuggling vulnerability that allows remote attackers to desynchronize request framing by sending a Transfer-Encoding header with any value, including non-chunked codings, which causes the library to unconditionally apply chunk-decoding and discard Content-Length. Attackers can exploit the discrepancy between tiny_http's improper Transfer-Encoding parsing and a correctly-implemented front-end proxy to produce two distinct interpretations of a single byte stream, enabling request smuggling, and can additionally send non-chunked bodies with non-chunked Transfer-Encoding values to cause failed body reads that tie up connections and consume worker threads without signaling errors to clients.",
  "id": "CVE-2026-66752",
  "modified": "2026-07-30T03:52:41.688730894Z",
  "published": "2026-07-28T15:44:41.573Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66752.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66752"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/tiny-http-http-request-smuggling-via-transfer-encoding-handling"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tiny-http/tiny-http"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/theopaid/HTTP-Request-Smuggling-via-Unparsed-Transfer-Encoding-Values-tiny_http-/tree/master"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "tiny-http 0.12.0 HTTP Request Smuggling via Transfer-Encoding Handling"
}