Change default max_frame_size#22
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mtrudel merged 2 commits intophoenixframework:mainfrom Apr 15, 2026
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I think this is fine to merge as-is |
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I'll get the failing test fixed up this evening (if you don't get to it first) and we'll get this out! |
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Currently, WebSockAdapter applies a default documented limit of
:infinityon incoming WebSocket frame size. This leaves default setups unprotected against malicious oversized payloads unless they explicitly configuremax_binary_sizeon the socket transport.(More specifically, the default value is not specified and is left to the underlying web servers like Bandit)
This is inconsistent with the long polling transport for Phoenix Channels, where incoming event messages are limited to 10MB (currently hardcoded).
This PR changes the default
max_frame_sizeto 10MB to match the limit already in place for long polling. Applications that need to support larger frames can opt out by raising or removing the limit explicitly.Strictly speaking, this would be a breaking change, but then again, web socket frames >10MB are not that common. WDYT?