{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*",
            "extracted_events": [
              {
                "introduced": "3.2.0"
              },
              {
                "fixed": "3.2.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE"
            ]
          },
          "events": [
            {
              "introduced": "b68251c03788ff39d4a4b25424df7360426e4afd"
            },
            {
              "fixed": "e1f22fdbe99afd2126b6fbf05bb12399359574b7"
            }
          ],
          "repo": "https://github.com/rack/rack",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rx22-g9mx-qrhv"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-93"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26962.json"
  },
  "details": "Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.",
  "id": "CVE-2026-26962",
  "modified": "2026-07-15T01:49:01.624095849Z",
  "published": "2026-04-02T17:10:17.091Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26962.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/rack/rack/security/advisories/GHSA-rx22-g9mx-qrhv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26962"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rack: Header injection in multipart requests"
}