{
  "cveId": "CVE-2026-53727",
  "url": "https://patchblox.com/security/cve/CVE-2026-53727",
  "summary": "CVE-2026-53727 is fixed in ruby-css-parser on 1 platform by DEBIAN-CVE-2026-53727 (version 3.0.0-1), released July 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ruby-css-parser: css_parser is a Ruby CSS parser",
  "description": "css_parser is a Ruby CSS parser. From 2.2.0 until 3.0.0, CssParser::Parser#read_remote_file in lib/css_parser/parser.rb, and therefore load_uri! and the @import-following branch of add_block!, issued HTTP and HTTPS requests against any host, port, and URI without a scheme allowlist, host or IP filtering, or protection against link-local, loopback, or RFC-1918 addresses. Location: redirects were followed recursively back into the same function, which also serviced file:// URIs, so a single attacker-controlled HTTP redirect could upgrade the bug from SSRF to arbitrary local file disclosure. Any consumer of css_parser that hands it attacker-influenced CSS together with a base_uri: option is exposed. This issue is fixed in version 3.0.0.",
  "published": "2026-07-17T21:17:07Z",
  "severity": "high",
  "cvss": 8.6,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
  "epss": 0.00506,
  "epssPercentile": 0.43494,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ruby-css-parser",
      "release": "Debian 14",
      "fixedVersion": "3.0.0-1",
      "fix": "DEBIAN-CVE-2026-53727",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53727",
      "released": "2026-07-19T12:50:38Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}