{
  "cveId": "CVE-2026-63382",
  "url": "https://patchblox.com/security/cve/CVE-2026-63382",
  "summary": "CVE-2026-63382 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: Libevent is an event notification library",
  "description": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.",
  "published": "2026-08-20T17:00:00Z",
  "severity": "Medium",
  "cvss": 8.6,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
  "epss": 0.01991,
  "epssPercentile": 0.80798,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "product": "libevent",
      "release": "Debian 12.15 (bookworm)",
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      "fix": "DEBIAN-CVE-2026-63382",
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      "released": "2026-08-21T23:37:15Z"
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      "product": "libevent",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.1.13-stable-1~deb13u1",
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      "released": "2026-08-21T23:37:15Z"
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      "release": "Debian 14",
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      "released": "2026-08-21T23:37:15Z"
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      "released": "2026-09-07T14:19:40Z"
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      "released": "2026-09-17T18:11:06Z"
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      "released": "2026-09-19T18:31:30Z"
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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"
  }
}