CVE-2026-115877

The Twisted event-based framework (Python 3.6+) is vulnerable to HTTP Request Smuggling prior to version 26.10.0rc1 . The root cause is located in twisted.web.http.HTTPChannel.headerReceived, which rejects NUL bytes but incorrectly accepts bare carriage returns (CR) or line feeds (LF) in header v...

CVE-2026-115877 Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value

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...