CVE-2026-44546

Low

Description

daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSocket handshake processing. Twisted does not treat \x0b, \x0c, \x1c, \x1d, \x1e, or \x85 as header line separators, but autobahn decodes header values to str and calls splitlines(). An attacker can exploit this parser differential to inject additional headers into the ASGI scope passed to the application. daphne now rejects requests with these bytes in any header value with a 400 response.

SeverityLow

CVSS3.7

Exploit probability—

Product

Djangoproject Daphne

PublishedJun 3, 2026

First seenJun 3, 2026

Weakness typeCWE-444CWE-444

How to fix

Update

djangoproject daphne4.2.2 or later
daphne4.2.2 or later

Vendor advisories

github.com/django/daphne/blob/main/CHANGELOG.txt

Affected products

Product	Affected versions	Fixed in
djangoproject daphne	v < 4.2.2	4.2.2
daphnePyPI	v < 4.2.2	4.2.2

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