# Jellyfin v12.0-rc6 — 12.0 RC6 - Product: Jellyfin (https://whatsnew.fyi/product/jellyfin) - Vendor: Jellyfin - Date: 2026-08-26 - Version: v12.0-rc6 - Original notes: https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc6 - Permalink: https://whatsnew.fyi/product/jellyfin/releases/v12.0-rc6 - Labels: Pre-release What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog. Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'. --- - **changed** — Drop the preceding 10. from versioning scheme, changing 10.11.x to 12.x - **changed** — Focus on performance improvements and polishing rough edges from the 10.11.0 backend rewrite - **fixed** — Fix FindArtists functionality - **added** — Recognize WEB-DL release tags in video names - **fixed** — Fix large playlist persistence with WhereOneOrMany - **fixed** — Fix SQLite variable limit in child count batches - **fixed** — Prevent orphaned user permissions and preferences - **changed** — Use client-reported position for idle playback cleanup - **changed** — Make MusicBrainz lookup more resilient - **fixed** — Fix latest items for mixed libraries - **added** — Allow direct play for HDHomeRun Live TV tuners - **security** — Fix GHSA-wwwm-px48-fpvq - **changed** — Optimize query helper memory - **fixed** — Safeguard against invalid provider ids - **fixed** — Fall back to the ancestor filter when a view has no top parents - **changed** — Mark breakOnNonKeyFrames as XMLIgnore - **changed** — Look up people by item via the credit map instead of a full scan - **fixed** — Fix English metadata blocking localized providers ranked below it - **fixed** — Fix series merging leaking across libraries and under-counting merged children - **changed** — Improve startup UI with newly enhanced progress reporting #### :rocket: Jellyfin Server 12.0 RC6 We are pleased to announce the sixth release candidate preview release of Jellyfin 12.0! This is a **preview** release, intended for those interested in testing 12.0 before its final public release. We welcome testers to help find as many bugs as we can before the final release. As always, please ensure you stop your Jellyfin server and take a full backup before upgrading! ##### A note about versioning Starting with this release, we are **dropping the preceding `10.` from our versioning**. Thus, `10.11.x` -> `[10.]12.x` = `12.x`. The reason is simple: at this point in the project, we don't envision a hard break in the API like we planned way back in the early days, and this version scheme was causing a lot of confusion amongst users about what a "major" release was. For more information, please see [the RC1 release notes](https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc1). ##### What's new? The main goal of this release has been performance. `10.11.0` dropped a **major** backend rewrite, and while it was broadly functional, it had a lot of rough edges. This release seeks to polish out most of those rough edges and bring better performance to all users. There are many other small fixes, improvements, changes, and translations. [See our draft release notes here](https://notes.jellyfin.org/v12.0_release_notes) or below for the full list of pull requests. You can also [view the Web side changelog here](https://github.com/jellyfin/jellyfin-web/releases/tag/v12.0-rc6). **Note:** You **must** be on Jellyfin 10.10.7+ or 10.11.x (ideally, 10.11.11) before upgrading! If you are not, the upgrade will fail. Ensure you upgrade to one of these versions **first**! **Note:** The initial load of Jellyfin 12.x will run a few migrations and will take several minutes. Please be patient and do not interrupt the process. You can leverage the (newly improved!) startup UI on your local network to see specific progress, or off-network to see general progress, by visiting the server URL in your web browser during startup. **Note:** If you install the RC, you should **disable all external plugins** and reinstall using [the unstable plugin repository](https://jellyfin.org/docs/general/server/plugins/#official-jellyfin-plugin-repositories), or plugins may fail to load and cause unintended side effects. ##### Installing This preview release is distributed in all our traditional forms, though not automatically via our Apt repository or `latest` tag. * For all non-Docker environments, you can find the files for manual download in [our repository](https://repo.jellyfin.org/?path=/server) by selecting "Stable Preview" for your OS. * For Docker, you can pull the `12.0-rc6` or `preview` tags. ##### What's Changed (since [`v12.0-rc5`](https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc5)) * Update dependency z440.atl.core to 7.16.0 by @renovate[bot] in https://github.com/jellyfin/jellyfin/pull/17551 * Fix FindArtists by @theguymadmax in https://github.com/jellyfin/jellyfin/pull/17604 * Update Microsoft to 10.0.11 by @renovate[bot] in https://github.com/jellyfin/jellyfin/pull/17615 * Fix unit test for localization of Artists in DE by @IDisposable in https://github.com/jellyfin/jellyfin/pull/17633 * Fix other two unit test for localization of Artists in DE by @IDisposable in https://github.com/jellyfin/jellyfin/pull/17637 * Recognize WEB-DL release tags in video names by @st7105 in https://github.com/jellyfin/jellyfin/pull/17636 * Update github/codeql-action action to v4.37.7 by @renovate[bot] in https://github.com/jellyfin/jellyfin/pull/17630 * Update dependency Microsoft.NET.Test.Sdk to 18.9.0 by @renovate[bot] in https://github.com/jellyfin/jellyfin/pull/17638 * Update dependency dotnet-ef to v10.0.11 by @renovate[bot] in https://github.com/jellyfin/jellyfin/pull/17614 * Fix large playlist persistence with WhereOneOrMany by @martin-77 in https://githu _[Truncated at 4000 characters — full notes: https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc6]_