{
  "cveId": "CVE-2026-121506",
  "url": "https://patchblox.com/security/cve/CVE-2026-121506",
  "summary": "CVE-2026-121506 is fixed in ntpsec on 1 platform by DEBIAN-CVE-2026-121506 (version 1.2.5\u002Bdfsg-1), released November 6, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ntpsec: An out-of-bounds read and write in NTS client extension field parsing (extens_client_recv) in NTPsec before 1.2.5 all...",
  "description": "An out-of-bounds read and write in NTS client extension field parsing (extens_client_recv) in NTPsec before 1.2.5 allows a remote attacker who can send NTP server-mode replies to an NTS client to corrupt heap memory and crash ntpd, and, combined with the NTS-KE client out-of-bounds read fixed in 1.2.4, to bypass NTS authentication and set the client\u0027s time, via an NTS Authenticator and Encrypted Extension Fields field whose nonce length exceeds the field.",
  "published": "2026-11-03T15:17:37Z",
  "severity": "high",
  "cvss": 7.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H",
  "epss": 0.00449,
  "epssPercentile": 0.39281,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ntpsec",
      "release": "Debian 14",
      "fixedVersion": "1.2.5\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2026-121506",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-121506",
      "released": "2026-11-06T19:42:20Z"
    }
  ],
  "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"
  }
}