{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8b892a8a11a632f5d52b877a49728808a142379a"
            }
          ],
          "repo": "https://github.com/capnproto/capnproto",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qjx3-pp3m-9jpm"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-190",
      "CWE-444"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32239.json"
  },
  "details": "Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.",
  "id": "CVE-2026-32239",
  "modified": "2026-04-01T23:10:31.204948093Z",
  "published": "2026-03-12T19:33:25.052Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://capnproto.org/capnproto-c++-1.4.0.tar.gz"
    },
    {
      "type": "WEB",
      "url": "https://capnproto.org/capnproto-c++-win32-1.4.0.zip"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32239.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32239"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cap'n Proto has an integer overflow in KJ-HTTP"
}