Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service
CVE-2026-44545

5.3MEDIUM

Key Information:

Vendor

Djangoproject

Status
Daphne
Vendor
CVE Published:
3 June 2026

What is CVE-2026-44545?

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.

Affected Version(s)

daphne 4.2.0 <= 4.2.1

daphne 4.2.2

References

https://github.com/django/daphne/blob/main/CHANGELOG.txt
release-notes

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

ParkHyunWoo
Carlton Gibson
.