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74541beb9c
The WeCom callback endpoint (internet-facing, 0.0.0.0) parsed untrusted request bodies before signature verification. defusedxml already guards the entity-expansion class on main, but there was no cap on raw body size, so an unauthenticated POST could still force unbounded read work pre-auth. Set client_max_size=64KB on the aiohttp app (413 at the framework layer) plus an explicit length guard in _handle_callback as defense in depth. WeCom callbacks are small encrypted XML envelopes — media is delivered out-of-band via MediaId, never inline — so 64KB is ample for legitimate traffic. Adds tests for oversized (413) and normal-sized (not 413) bodies. Salvaged from #10192 by @memosr (body-size limit half; defusedxml half already superseded on main). |
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