CVE-2026-115877

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Source
https://cve.org/CVERecord?id=CVE-2026-115877
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115877.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-115877
Aliases
Downstream
Published
2026-10-23T20:25:12Z
Modified
2026-10-25T02:45:57Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
Summary
Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value
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.

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",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "26.10.0rc1"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StringRangeExpression"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "introduced":  "3.6+"
                        },
                        {
                            "fixed":  "26.10.0rc1"
                        },
                        {
                            "fixed":  "26.10.0rc1"
                        }
                    ],
                    "source":  "DESCRIPTION"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/twisted/twisted

Affected ranges

Type
GIT
Repo
https://github.com/twisted/twisted
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a
Fixed
1616f702d36eda8990a5a5b22ad70fab140a7eb1
Fixed
875d118c9a82a4f55a92ff399bd31f8928a52ad3
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "fixed":  "022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "1616f702d36eda8990a5a5b22ad70fab140a7eb1"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "twisted-26.10.0rc1",
            "range":  [
                {
                    "fixed":  "875d118c9a82a4f55a92ff399bd31f8928a52ad3"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

Other
before-black

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115877.json"