{
  "cveId": "CVE-2026-53537",
  "url": "https://patchblox.com/security/cve/CVE-2026-53537",
  "summary": "CVE-2026-53537 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-53537, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "python-multipart: Python-Multipart is a streaming multipart parser for Python",
  "description": "Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, parse_options_header parsed Content-Disposition (and Content-Type) headers with email.message.Message, which transparently applies RFC 2231/5987 decoding. The extended parameter syntax (filename*=charset\u0027lang\u0027value, name*=..., and the filename*0/filename*1 continuation form) is decoded and surfaced under the bare filename/name key, and overrides the plain parameter when both are present. RFC 7578 \u00A74.2 explicitly forbids the filename* form in multipart/form-data. Components that follow RFC 7578, or that do not implement RFC 2231/5987 decoding for multipart/form-data (WAFs, proxies, gateways), may interpret such a header differently. An attacker can exploit that difference to smuggle a different field name or filename past an upstream inspector to the backend. This vulnerability is fixed in 0.0.30.",
  "published": "2026-06-22T18:16:44Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "epss": 0.00291,
  "epssPercentile": 0.21851,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "python-multipart",
      "release": "Debian 14",
      "fixedVersion": "0.0.32-1",
      "fix": "DEBIAN-CVE-2026-53537",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53537",
      "released": "2026-06-22T18:16:44Z"
    },
    {
      "platform": "linux",
      "product": "python-python-multipart",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "0.0.20-160000.5.1",
      "fix": "OPENSUSE-SU-2026:21066-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21066-1",
      "released": "2026-06-26T07:58:44Z"
    },
    {
      "platform": "linux",
      "product": "python-python-multipart",
      "release": "sles 16.0",
      "fixedVersion": "0.0.20-160000.5.1",
      "fix": "SUSE-SU-2026:22372-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22372-1",
      "released": "2026-06-26T07:58:40Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}