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Limit the size of the aggregation_key #12101

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1 change: 1 addition & 0 deletions changelog.d/12101.misc
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Limit the size of `aggregation_key` on annotations.
3 changes: 3 additions & 0 deletions synapse/handlers/message.py
Original file line number Diff line number Diff line change
Expand Up @@ -1067,6 +1067,9 @@ async def _validate_event_relation(self, event: EventBase) -> None:
if relation_type == RelationTypes.ANNOTATION:
aggregation_key = relation["key"]

if len(aggregation_key) > 500:
raise SynapseError(400, "Aggregation key is too long")

already_exists = await self.store.has_user_annotated_event(
relates_to, event.type, aggregation_key, event.sender
)
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