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Priority LOW 28

Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers.

CVSS 4.0MEDIUM 6.3 Network No auth No interaction EPSS 0.00249 Published 2026-09-15 Partial fix · 6.4.1 CWE-113
Priority HIGH 72

Tornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no message body and parsing the chunked body as a subsequent request.

CVSS 4.0CRITICAL 9.0 Network No auth No interaction EPSS 0.00361 Published 2026-09-15 Partial fix · 6.4.1 CWE-444