Issues

• Sliding sync and /keys/changes do not report a user in device_lists.changed when they go from invited to joined

  A-Device-List-TrackingA-Sync
  element-hq/synapse#20486 · Filter by author Oele opened on Nov 6, 2026
  1

• Sliding sync never sends a room again once its partial state is resolved

  A-Federated-JoinA-JoinA-Sync
  element-hq/synapse#20483 · Filter by author 9clg6 opened on Nov 5, 2026

• MSC1763: support for unstable identifiers

  A-Message-Retention-PoliciesA-RetentionA-Spec-ComplianceT-ExperimentalFeature
  element-hq/synapse#20478 · Filter by author mxandreas opened on Nov 5, 2026

• Feature Request: Dynamic excluded_user_ids Support via Synapse Module API

  A-ModulesA-Server-AnnouncementsT-Enhancement
  element-hq/synapse#20473 · Filter by author watermelon0339 opened on Nov 5, 2026
  3

• MSC4536: Additional endpoint for fetching user profiles

  A-ProfilesT-ExperimentalFeature
  element-hq/synapse#20471 · Filter by author jaywink opened on Nov 4, 2026

• [Server Announcements] If a management user avatar is larger than max_avatar_size, reconcilitation will fail

  A-ConfigA-Server-AnnouncementsO-UncommonS-TolerableT-Defect
  element-hq/synapse#20470 · Filter by author anoadragon453 opened on Nov 4, 2026

• Jumping from Synapse <1.163 to 1.164 logs out rust-sdk-based clients

  A-Login
  element-hq/synapse#20459 · Filter by author sandhose opened on Nov 2, 2026
  1

• Appservices stay down indefinitely when an assert aborts the scheduler start loop

  A-Application-Service
  element-hq/synapse#20454 · Filter by author coffee-the-dev opened on Oct 31, 2026
  1

• MSC4143: MatrixRTC

  A-VoIPT-ExperimentalFeature
  element-hq/synapse#20447 · Filter by author devonh opened on Oct 29, 2026
  1

• Synapse fails to de-outlier the create event if the origin server responds with http 404 to requests for state id's at the create event

  A-Federated-JoinA-FederationA-Join
  element-hq/synapse#20445 · Filter by author ll-SKY-ll opened on Oct 29, 2026

• Reject null profile field values in all cases

  A-ProfilesT-TaskZ-Future-Maintenance
  element-hq/synapse#20424 · Filter by author jaywink opened on Oct 28, 2026

• Rely on the system CA trust store for everything (avoid bundled certs)

  T-Task
  element-hq/synapse#20396 · Filter by author MadLittleMods opened on Oct 22, 2026

• Synapse returns M_FORBIDDEN on /backfill for redactions/dummy events it serves over /event

  A-Event-EndpointA-Federation
  element-hq/synapse#20393 · Filter by author gamesguru opened on Oct 22, 2026

• Avoid bumping Cargo.toml for every Rust dependency update (minimum Rust dependency versions)

  dependenciesrustT-TaskZ-Rust
  element-hq/synapse#20385 · Filter by author MadLittleMods opened on Oct 20, 2026

• ARM64 packages for the Debian/Ubuntu repo

  A-Packaging
  element-hq/synapse#20370 · Filter by author bxdxnn opened on Oct 16, 2026

• Add expiration/cleanup mechanism for e2e_room_keys

  A-DatabaseA-E2EEA-Performance
  element-hq/synapse#20361 · Filter by author watermelon0339 opened on Oct 15, 2026
  8

• It might be possible for message retention policies to break sticky event catchup transactions by deleting the prev_event

  A-FederationA-RetentionA-Sticky-EventsT-DefectZ-Uncertain
  element-hq/synapse#20357 · Filter by author reivilibre opened on Oct 14, 2026
  

• [Sliding sync] to-device messages suddenly stop getting delivered on one device

  A-SyncA-to-device-messages
  element-hq/synapse#20355 · Filter by author uhoreg opened on Oct 13, 2026

• [Server Announcements] Handling read receipts

  A-Read-ReceiptsA-Server-Announcements
  element-hq/synapse#20351 · Filter by author anoadragon453 opened on Oct 13, 2026
  

• MSC4448: URL preview for site logos

  A-URL-PreviewT-ExperimentalFeature
  element-hq/synapse#20348 · Filter by author ZacksBot opened on Oct 13, 2026

• [Server Announcements] Injecting state events and messages into user's /sync streams

  A-Server-AnnouncementsA-Sync
  element-hq/synapse#20345 · Filter by author anoadragon453 opened on Oct 12, 2026
  

• [Server Announcements] Creating and configuring server announcement rooms

  A-ConfigA-Server-Announcements
  element-hq/synapse#20344 · Filter by author anoadragon453 opened on Oct 12, 2026
  9

  

• Appservice remains down with queued transactions until another room event is sent

  A-Application-Service
  element-hq/synapse#20342 · Filter by author rbondesson opened on Oct 12, 2026
  1

• Add support for Python 3.15

  A-Operabilitypython
  element-hq/synapse#20340 · Filter by author anoadragon453 opened on Oct 9, 2026

• CI run against Twisted trunk is failing

  A-CIA-Testing
  element-hq/synapse#20329 · Filter by author github-actions opened on Oct 8, 2026