{
  "cveId": "CVE-2026-115877",
  "url": "https://patchblox.com/security/cve/CVE-2026-115877",
  "summary": "CVE-2026-115877 is fixed in twisted on 1 platform by DEBIAN-CVE-2026-115877 (version 26.10.0-1), released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value",
  "description": "Twisted is an event-based framework for internet applications, supporting Python 3.6\u002B. Prior to 26.10.0rc1, twisted.web.http.HTTPChannel.headerReceived rejects a NUL byte in an HTTP header value but accepts a bare carriage return or bare line feed. Because Twisted splits header lines only on CRLF, a hidden Content-Length header can remain folded into another value while a lenient front end treats the bare character as a line terminator. The resulting framing disagreement can smuggle a following request past front-end access controls, poison a shared connection or cache, and expose a later client to the wrong response. This issue is an incomplete-fix residual of earlier Twisted request-smuggling protections. This issue is fixed in version 26.10.0rc1.",
  "published": "2026-10-23T21:17:23Z",
  "severity": "Moderate",
  "cvss": 5.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
  "cwe": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
  "epss": 0.00257,
  "epssPercentile": 0.17416,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-115877",
  "fixes": [
    {
      "platform": "linux",
      "product": "twisted",
      "release": "Debian 14",
      "fixedVersion": "26.10.0-1",
      "fix": "DEBIAN-CVE-2026-115877",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-115877",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "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"
  }
}