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Exclude rejected state events when calculating state at backwards extrems#6527
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…rems (#6527) This fixes a weird bug where, if you were determined enough, you could end up with a rejected event forming part of the state at a backwards-extremity. Authing that backwards extrem would then lead to us trying to pull the rejected event from the db (with allow_rejected=False), which would fail with a 404.
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Synapse 1.7.1 (2019-12-18) ========================== This release includes several security fixes as well as a fix to a bug exposed by the security fixes. Administrators are encouraged to upgrade as soon as possible. Security updates ---------------- - Fix a bug which could cause room events to be incorrectly authorized using events from a different room. ([\#6501](#6501), [\#6503](#6503), [\#6521](#6521), [\#6524](#6524), [\#6530](#6530), [\#6531](#6531)) - Fix a bug causing responses to the `/context` client endpoint to not use the pruned version of the event. ([\#6553](#6553)) - Fix a cause of state resets in room versions 2 onwards. ([\#6556](#6556), [\#6560](#6560)) Bugfixes -------- - Fix a bug which could cause the federation server to incorrectly return errors when handling certain obscure event graphs. ([\#6526](#6526), [\#6527](#6527))
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This fixes a weird bug where, if you were determined enough, you could end up with a rejected event forming part of the state at a backwards-extremity. Authing that backwards extrem would then lead to us trying to pull the rejected event from the db (with
allow_rejected=False), which would fail with a 404.Based on #6526.