chore(deps): update ghcr.io/element-hq/synapse docker tag to v1.152.1

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/element-hq/synapse	minor	v1.149.1 → v1.152.1

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Release Notes

element-hq/synapse (ghcr.io/element-hq/synapse)

v1.152.1

Compare Source

Synapse 1.152.1 (2026-05-07)

Security Fixes

• Prevent CPU starvation (Denial of Service) under worker lock contention, additionally capping the WorkerLock time out interval to a maximum of 60 seconds. Contributed by Famedly. (#​19394, ELEMENTSEC-2026-1706, GHSA-8q93-326v-3m7g, CVE-2026-45078)
• Prevent pagination ending when a page is full of rejected events. (ELEMENTSEC-2025-1636, GHSA-6qf2-7x63-mm6v, CVE-2026-45076)

v1.152.0

Compare Source

Synapse 1.152.0 (2026-04-28)

No significant changes since 1.152.0rc1.

Configuration changes needed for deployments using workers

For deployments using workers, please note that this version introduces a new quarantined_media_changes stream writer, which may require configuration changes.
Please see the the relevant section in the upgrade notes for details.

Without configuring this new stream writer, only the main process will be able to handle the /media/quarantine admin API endpoints for quarantining media.

Synapse 1.152.0rc1 (2026-04-22)

Features

• Add a "Listing quarantined media changes" Admin API for retrieving a paginated record of when media became (un)quarantined. (#​19558, #​19677, #​19694)
• Advertise MSC4445 sync timeline order in unstable_features. (#​19642)
• Report the Rust compiler version used in the Prometheus metrics. Contributed by Noah Markert. (#​19643)
• Passthrough 'article' and 'profile' OpenGraph metadata on URL preview requests. (#​19659)
• Add a way to re-sign local events with a new signing key. (#​19668)
• Support MSC4450: Identity Provider selection for User-Interactive Authentication with Legacy Single Sign-On. (#​19693)
• Add experimental support for MSC4242: State DAGs. Excludes federation support. (#​19424)
• Adds Admin API endpoints to
  list, fetch and delete user reports. (#​19657)
• Reduce database disk space usage by pruning old rows from device_lists_changes_in_room. (#​19473, #​19709)

Bugfixes

• Reject device_keys: null in the request to POST /_matrix/client/v3/keys/upload, as per the spec. This was temporarily allowed as a workaround for misbehaving clients. (#​19637)
• Fix database migrations failing on platforms where SQLite is configured with SQLITE_DBCONFIG_DEFENSIVE by default, such as macOS. (#​19690)
• Fix a bug introduced in v1.145 where a non-admin could bypass admin checks for downloading remote quarantined media. This relied on the media already being previously present on the homeserver. (#​19639)

Improved Documentation

• Include a workaround for running the unit tests with SQLite under recent versions of MacOS. (#​19615)
• Fix Docker image link typo in worker docs. (#​19645)
• Update the developer stream docs for creating a new stream to point out _setup_sequence(...) in portdb. (#​19675)
• Update the developer stream docs for creating a new stream to highlight places that require documentation updates. (#​19696)

Internal Changes

• Update CI to use re-usable Complement GitHub CI workflow. (#​19533)
• Fix docstring for limit argument in _maybe_backfill_inner(...). (#​19630)
• Document context for why increase timeout for policy server requests. (#​19633)
• Run lint script to format Complement tests introduced in #​19509. (#​19636)
• Small simplifications to the events class. (#​19680, #​19712)
• Introduce spam_checker_spammy internal event metadata. (#​19453)
• Add a FilteredEvent class that saves us copying events. (#​19640)
• Convert EventInternalMetadata to use Arc<RwLock<_>>. (#​19669)

v1.151.0

Compare Source

Bugfixes

• Fix KNOWN_ROOM_VERSIONS.__contains__ raising TypeError for non-string keys, which could cause /sync to fail for rooms with a NULL room version in the database. Bug introduced in #​19589 as part of v1.151.0rc1. (#​19649)

v1.150.0

Compare Source

Synapse 1.150.0 (2026-03-24)

No significant changes since 1.150.0rc1.

Upgrade notes

Please read the upgrade notes as this release includes a few changes that may affect your deployment.

Synapse 1.150.0rc1 (2026-03-17)

Features

• Add experimental support for the MSC4370 Federation API GET /extremities endpoint. (#​19314)
• MSC4140: Cancellable delayed events: When persisting a delayed event to the timeline, include its delay_id in the event's unsigned section in /sync responses to the event sender. (#​19479)
• Expose MSC4354 Sticky Events over the legacy (v3) /sync API. (#​19487)
• When Matrix Authentication Service (MAS) integration is enabled, allow MAS to set the user locked status in Synapse. (#​19554)

Bugfixes

• Fix Build and push complement image CI job pointing to non-existent image. (#​19523)
• Fix a bug introduced in v1.26.0 that caused deactivated, erased users to not be removed from the user directory. (#​19542)

Improved Documentation

• In the Admin API documentation, always express path parameters as /<param> instead of as /$param. (#​19307)
• Update docs to clarify outbound_federation_restricted_to can also be used with the Secure Border Gateway (SBG). (#​19517)
• Unify Complement developer docs. (#​19518)

Internal Changes

• Put membership updates in a background resumable task when changing the avatar or the display name. (#​19311)
• Add in-repo Complement test to sanity check Synapse version matches git checkout (testing what we think we are). (#​19476)
• Migrate dev dependencies to PEP 735 dependency groups. (#​19490)
• Remove the optional systemd-python dependency and the systemd extra on the synapse package. (#​19491)
• Avoid re-computing the event ID when cloning events. (#​19527)
• Allow caching of the /versions and /auth_metadata public endpoints. (#​19530)
• Add a few labels to the number groupings in the Processed request logs. (#​19548)

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