CVE-2026-44545

Name	CVE-2026-44545
Description	daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1138864

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-daphne (PTS)	bullseye	3.0.1-1	vulnerable
	bookworm	4.0.0-1	vulnerable
	trixie	4.1.2-2	vulnerable
	forky, sid	4.2.1-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-daphne	source	(unstable)	(unfixed)			1138864

Notes

[trixie] - python-daphne <no-dsa> (Minor issue)
[bookworm] - python-daphne <no-dsa> (Minor issue)
[bullseye] - python-daphne <postponed> (Minor issue)
Fixed by: https://github.com/django/daphne/commit/32f8be0fb0bf2a441085cb45e0e8f45455f0793e (4.2.2)