{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "26.10.0rc1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "1616f702d36eda8990a5a5b22ad70fab140a7eb1"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "twisted-26.10.0rc1",
                "range": [
                  {
                    "fixed": "875d118c9a82a4f55a92ff399bd31f8928a52ad3"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "875d118c9a82a4f55a92ff399bd31f8928a52ad3"
            },
            {
              "fixed": "022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a"
            },
            {
              "fixed": "1616f702d36eda8990a5a5b22ad70fab140a7eb1"
            }
          ],
          "repo": "https://github.com/twisted/twisted",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-q7qq-6mhp-9rc4"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-444"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115877.json"
  },
  "details": "Twisted is an event-based framework for internet applications, supporting Python 3.6+. 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.",
  "id": "CVE-2026-115877",
  "modified": "2026-10-25T10:30:20.959113505Z",
  "published": "2026-10-23T20:25:12.031Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115877.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/twisted/twisted/security/advisories/GHSA-q7qq-6mhp-9rc4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115877"
    },
    {
      "type": "FIX",
      "url": "https://github.com/twisted/twisted/commit/022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/twisted/twisted/commit/1616f702d36eda8990a5a5b22ad70fab140a7eb1"
    },
    {
      "type": "FIX",
      "url": "https://github.com/twisted/twisted/pull/12755"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value"
}