ArangoDB version 3.12.9 released

[vadim]

We are happy to announce the release of ArangoDB version 3.12.9!

This patch version is ready for production deployment and is a recommended upgrade for all 3.12 users.

Apart from some basic cleanup and code improvements related to found issues, the following notable things have been added to the 3.12.8 version of ArangoDB:

• Bump lodash from 4.17.21 to 4.18.1.
• Bump @xmldom/xmldom from 0.8.10 to 0.8.12.
• Updated ArangoDB Starter to v0.19.19.
• Updated timezone database as of 31.03.2026.
• Vector index creation with `inBackground: false` now blocks until training completes and returns the current `trainingState` in the response.
• Lowered the vector index training threshold from `nLists * max_points_per_centroid` to `nLists`, allowing vector indexes to be trained with fewer documents in the collection.
• Make defaults for JavaScript security options stricter.
• Rebuilt included rclone v1.65.2 with go1.25.8 and non-vulnerable dependencies.
• COR-123: The push-filter-into-enumerate-near optimizer rule now considers all compatible vector indexes on a collection to find if one whose storedValues cover the filter expression.
• COR-271: If a query uses an OR condition that affects multiple indexes the covering index optimisation is now applied.
• COR-298: Merge satellite joins to snippets that start with a Distribute node.

Full changelog can be found here: https://github.com/arangodb/arangodb/blob/v3.12.9/CHANGELOG.
 
Version 3.12.9 distributives can be obtained at https://www.arango.ai/downloads/.