Zulip Server 12.1

Released 2026-06-26

• When the require_e2ee_push_notifications setting is enabled, legacy push notifications are now skipped entirely, rather than sent with redacted content.
• Fixed signing up via an external authentication method (e.g., SAML) in organizations that require an invitation to join: pending email invitations are now honored, not just multiuse invite links.
• Fixed a long-standing bug where new users present in the LDAP directory could not sign up via an external authentication method (e.g., SAML); registration silently redirected back to the login page.
• Fixed an error preventing the data exports panel in organization settings from loading, for organizations that had been imported from another Zulip server. This release includes a migration to fix problematic export records created by earlier versions.
• Fixed quoting or viewing the source of messages in public channels the user is not subscribed to.
• Fixed user typeaheads displaying “null” in place of a hidden email address.
• Fixed the member list in group settings being cut off, with no way to scroll through the full list of members.
• Fixed a server error when saving channel descriptions containing Dropbox links.
• Fixed GIF search returning an error for users with certain language settings.
• Improved email gateway handling of long subjects: the full subject is now included in the message body when it is truncated to fit in a topic.
• Improved Mattermost import tooling to handle attachment files missing from the export.
• The topic summarization feature now uses the OpenAI Python SDK, rather than litellm. Installations using TOPIC_SUMMARIZATION_MODEL must update their configuration: the setting now takes a plain model name, with OpenAI-compatible providers configured via the new TOPIC_SUMMARIZATION_API_BASE setting.
• Added an OIDC_REQUIRE_LIMIT_TO_SUBDOMAINS setting, like the existing SAML_REQUIRE_LIMIT_TO_SUBDOMAINS setting. If enabled, each configured OIDC identity provider is required to declare which subdomains it can be used for.
• Added checks that the file upload storage backend is correctly configured.
• Improved configuration checks and error messages for Helm and Docker deployments.
• Fixed restore-backup to preserve symlinked uploads and configuration directories.
• Fixed restore-backup failing on some systems, where the PostgreSQL user did not have permission to read the restore scripts.
• Raised the locked-memory limit for PostgreSQL, fixing PostgreSQL 18 startup failures with io_uring on Linux kernels >= 6.14 (e.g., Ubuntu 26.04).
• Fixed RabbitMQ setup in various scripts failing when a non-default RABBITMQ_VHOST was set.
• Added a timeout and debug logging for downloads of Puppet dependencies during installation and upgrade.
• Improved documentation for Docker-based deployments.
• Updated Python dependencies.