VDB
KO
HIGH 7.5

PYSEC-2026-213

Details

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.

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Affected packages

PyPI / daphne
Introduced in: 0 Fixed in: 4.2.2
Fix pip install --upgrade 'daphne>=4.2.2'

References