{
  "cveId": "CVE-2026-21869",
  "url": "https://patchblox.com/security/cve/CVE-2026-21869",
  "summary": "CVE-2026-21869 is fixed in llama.cpp on 1 platform by DEBIAN-CVE-2026-21869 (version 7593\u002Bdfsg-1), released January 8, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "llama.cpp: llama.cpp is an inference of several LLM models in C/C\u002B\u002B",
  "description": "llama.cpp is an inference of several LLM models in C/C\u002B\u002B. In commits 55d4206c8 and prior, the n_discard parameter is parsed directly from JSON input in the llama.cpp server\u0027s completion endpoints without validation to ensure it\u0027s non-negative. When a negative value is supplied and the context fills up, llama_memory_seq_rm/add receives a reversed range and negative offset, causing out-of-bounds memory writes in the token evaluation loop. This deterministic memory corruption can crash the process or enable remote code execution (RCE). There is no fix at the time of publication.",
  "published": "2026-01-08T00:16:00Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00528,
  "epssPercentile": 0.4492,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "llama.cpp",
      "release": "Debian 14",
      "fixedVersion": "7593\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2026-21869",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-21869",
      "released": "2026-01-08T00:16:00Z"
    }
  ],
  "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"
  }
}