{
  "cveId": "CVE-2026-63435",
  "url": "https://patchblox.com/security/cve/CVE-2026-63435",
  "summary": "CVE-2026-63435 is fixed in ruby-mail on 1 platform by DEBIAN-CVE-2026-63435 (version 2.9.1-1), released September 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ruby-mail: Mail is an internet library for Ruby designed to handle email generation, parsing, and sending",
  "description": "Mail is an internet library for Ruby designed to handle email generation, parsing, and sending. Prior to 2.9.1, Mail::Utilities.q_value_decode and Mail::Utilities.b_value_decode used a single String#match and an overly greedy charset capture to decode only the first RFC 2047 encoded-word and mishandle surrounding or subsequent text. A crafted malformed encoded-word in an address display name or local part could cross ? delimiters and make decoded From, To, or Reply-To header values differ from the raw values inspected by a human reviewer or downstream parser, enabling apparent sender or recipient spoofing, phishing, or authorization-check bypass. This issue is fixed in version 2.9.1.",
  "published": "2026-09-01T21:18:35Z",
  "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": 0.00448,
  "epssPercentile": 0.39212,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ruby-mail",
      "release": "Debian 14",
      "fixedVersion": "2.9.1-1",
      "fix": "DEBIAN-CVE-2026-63435",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-63435",
      "released": "2026-09-05T01:57:10Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}