Threat Intelligence Database

CVE-2026-44546 is a low-severity vulnerability in djangoproject's daphne server version 4.2.0. It arises from inconsistent parsing of HTTP headers between Twisted and autobahn libraries during WebSocket handshake processing. Specifically, certain control characters are not treated as header separators by Twisted but are split by autobahn, allowing an attacker to inject additional headers into the ASGI scope. This can lead to HTTP request smuggling. The issue is fixed in daphne versions after 4.2.0, where requests containing these bytes in header values are rejected with a 400 response.

daphne versions before 4.2.2 do not limit the size of WebSocket messages or frames due to not passing maxFramePayloadSize or maxMessagePayloadSize parameters to Autobahn's WebSocketServerFactory. This allows unauthenticated remote attackers to send arbitrarily large WebSocket frames or messages, potentially causing excessive memory consumption and denial of service. The vulnerability is identified as CWE-770 and has a medium severity with a CVSS score of 5.3.