{
  "cveId": "CVE-2026-63383",
  "url": "https://patchblox.com/security/cve/CVE-2026-63383",
  "summary": "CVE-2026-63383 is fixed in 20 products on 1 platform, first by libevent-2.1-7t64 2.1.12-stable-10ubuntu0.1, released August 20, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Libevent: decode_tag_internal() can lead to out-of-bounds read",
  "description": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
  "published": "2026-08-20T17:00:00Z",
  "severity": "Important",
  "cvss": 8.6,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
  "cwe": "Out-of-bounds Read",
  "epss": 0.00488,
  "epssPercentile": 0.42287,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63383",
  "fixes": [
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      "platform": "linux",
      "product": "libevent",
      "release": "Debian 12.15 (bookworm)",
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      "fix": "DEBIAN-CVE-2026-63383",
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      "released": "2026-08-21T23:37:15Z"
    },
    {
      "platform": "linux",
      "product": "libevent",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.1.13-stable-1~deb13u1",
      "fix": "DEBIAN-CVE-2026-63383",
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      "released": "2026-08-21T23:37:15Z"
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    {
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      "product": "libevent",
      "release": "Debian 14",
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      "released": "2026-08-21T23:37:15Z"
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      "fix": "RHSA-2026:67909",
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      "released": "2026-09-17T18:11:06Z"
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      "released": "2026-09-19T18:31:30Z"
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      "released": "2026-09-19T18:32:55Z"
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}