Tuwunel 1.7.0

May 21, 2026

All servers raising their cache_capacity_modifier above default must consider decreasing it to deploy this release. The default of 1.0 is now generally recommended, and up to 2.0 for systems with four or less cores. Taking no action may cost 25% to 50% more memory (#123).

Nine additional MSCs have landed. Current status is kept up to date in our documentation.

New Features & Enhancements

• Threaded read receipts and notifications (MSC3771, MSC3773) ship across storage, federation, sync v3, SSS v5, and the push gateway. Existing users may see a one-time jump in unread or badge counts that previously sat at the main-context-only total.

• MSC4225 one-time-key upload-order issuance is implemented. Operator note: the legacy onetimekeyid_onetimekeys column is dropped on first read-write open and existing OTKs are erased; clients re-upload on their next /sync, with MSC2732 fallback keys (where present) covering the gap. The wipe is one-way; read-only and secondary replicas tolerate the missing column until the primary recreates it.

• MSC4222 state_after on /sync v3 as an opt-in via ?use_state_after=true. Clients that don't opt in are unaffected.

• MSC4115 unsigned.membership on served events from encrypted rooms. Informational; clients that ignore the field are unaffected.

• Synapse-compatible shared-secret register endpoint at /_synapse/admin/v1/register, raised by @iwalkalone69 in (#38). The admin module was also split into a directory of units.

• Refresh-token expiry with optional hard logout via three new keys: refresh_token_ttl, refresh_token_idle_only, and refresh_token_hard_logout. All default disabled.

• Configurable extra OIDC authorization parameters, courtesy of @Batmaev in (#450). Closes the silent-relogin gap with Logto and Element X when operators set prompt = "login". Thank you!

• MSC4452 preview_url capability is advertised on /capabilities.

• MSC4466 propagate_to profile query parameter is implemented; the room fan-out also runs concurrently.

• MSC3283 m.set_displayname and m.set_avatar_url capabilities are advertised.

• MSC3814 fallback keys on dehydrated-device PUT are now stored.

• OpenTelemetry OTLP exporter replaces the deprecated opentelemetry-jaeger crate, closing (#85); tokio-console is re-enabled.

• Tip of the hat to @nyakokitsu, who reported in (#460) that turn_uris set without TURN credentials produces empty creds silently. Tuwunel now warns at startup.

• Thanks to @dasha-uwu for simplifying servers_route_via.

• Per-cache defaults were rebalanced from observed utilization in (#123): auth_chain up 15x to 1.5M, several shorteventid/eventid caches 4x to 400k. Closes (#123) and (#423) opened by @scanash00; an earlier report by @alythemonk in (#262) on Oracle Linux OOM-via-PGTABLE is also addressed. Operators on <= 2 GiB hosts may want to clamp the cache modifiers in their toml to restore the previous baseline.

• Admin db memory-usage is now tabular (used / cap / util%) with per-pool block-cache rows.

• Configuration items are annotated in the generated tuwunel-example.toml to indicate runtime-reloadable vs restart-required.

• The KV codec's additive-tail invariant for trailing Option<_>, &str, and &[u8] fields is documented.

• A migration upgrades legacy mediaid_user keys to the composite layout.

• Thank you @NiklausHofer for the Gentoo Guru ebuild in "Getting Started" (#461).

• Docs: enable_loopback_candidate troubleshooting motivated by @Lama-Thematique in (#451), ip_source for reverse-proxy users, and an MSC table refresh (MSC3419 verified, MSC1957 n/a, rows for MSC4461 through MSC4474). Closes (#94) opened by @MrRinkana.

• Thanks to @winyadepla for the traefik MatrixRTC config in (#462) bringing parity with nginx and caddy. Also addresses (#69) opened by @GZEI.

• CI gained a Complement job-summary script, a Playwright stage, and drift detection so a missed tuwunel-example.toml regeneration fails check and clippy.

Bug Fixes

• A v1.6.2 regression on non-S3 storage backends panicked the main thread on first upload. Reported by @Sommerwiesel in (#452); multipart is now gated on S3 only. Sincere apologies for the disruption.

• @BVollmerhaus graciously reported in (#454) that MSC2246 asynchronous media uploads could self-deadlock on the notifier mutex; the acquisition order is fixed. Thank you!

• Thanks to @digikar99, who reported in (#459) that the UIAA fallback acknowledgement rejected non-SSO flows; the registration token + password flow completes cleanly.

• Sliding-sync cached list ranges refresh on every explicit list update, shipped by @lhjt in (#455); previously a scrolled-to range was ignored indefinitely. Thank you!

• /threads and /backfill apply the visibility filter before pagination take, so a final non-empty page still returns next_batch.

• GitHub OIDC default base_path now aligns with their published discovery doc after they quietly changed the issuer (eb51c70ca, 6552f8668).

• OAuth Dynamic Client Registration records are bounded to a fixed size. Thanks @CEbbinghaus! (e5f625d89).

• OAuth SSO grant params win over operator-configured extras on key collision (05dba7ee9).

• Receipts and presence EDU emission is bounded below the federation budget (b4fcf5871).

• Membership tolerates stale room state on self-leave (39c72c233).

• A missed optimization in /state and map-value storage was corrected (b305e6a86); /state now also propagates per-PDU read errors instead of silently skipping corrupt events.

• Five route doc-headers had incorrect HTTP verbs (a40ca8f0a).

• The Docker bake file dropped the non-functional cache_to/cache_from directives (8e4bc8c68).

• Thank you @pedrompcaetano for the typo fix in tuwunel.container (#456).

• Stale comments and fan-out destructure cleanups (85e85c883, 9c4cd7c33, 2cc249363).