{
  "cveId": "CVE-2026-54522",
  "url": "https://patchblox.com/security/cve/CVE-2026-54522",
  "summary": "CVE-2026-54522 is fixed in ruby-msgpack on 1 platform by DEBIAN-CVE-2026-54522 (version 1.8.3-1), released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ruby-msgpack: MessagePack for Ruby is an implementation of the MessagePack binary serialization format",
  "description": "MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2, MessagePack::Buffer#clear in ext/msgpack/buffer.c leaves rmem_last, rmem_end, and rmem_owner stale after _msgpack_buffer_shift_chunk returns an rmem page to the shared pool, allowing a subsequent Buffer#write and a second MessagePack::Buffer to alias the page and disclose or corrupt cross-buffer data. This issue is fixed in version 1.8.2.",
  "published": "2026-07-30T17:16:33Z",
  "severity": "medium",
  "cvss": 5.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
  "epss": 0.00227,
  "epssPercentile": 0.1348,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ruby-msgpack",
      "release": "Debian 14",
      "fixedVersion": "1.8.3-1",
      "fix": "DEBIAN-CVE-2026-54522",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-54522",
      "released": "2026-07-31T14:18:19Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}