Release Notes: Neo4j Aura Database – January 2026

Release Date: 16 January 2026

The Neo4j Aura January release has started to roll out, commencing on AuraDB Free and progressing to higher tiers later. 

Release Note for Neo4j 2025.12.1 (Release date: 16 January 2026)

Server

Security

• Patched lz4 to version 1.10.1 to resolve CVE-2025-66566
• Patched Jersey to version 2.46 to resolve CVE-2025-12383

 

Bug fixes

Cypher

• Fixed an issue where we could underestimate the heap usage of DISTINCT in Cypher queries. For queries with very large DISTINCT sets this could lead to a JVM OutOfMemoryError instead of the normal recoverable “The memory pool limit was exceeded” error.
• Fixed a bug where using a subquery expression in allReduce() initializer would fail with an error like Did not find UNNAMED9 in the slot configuration. 
• Fixed a bug in parallel runtime queue maintenance where failed queries were holding on to heap memory for longer than necessary.
• Fixed a bug when returning entities located inside a map or list where these were incorrectly evaluated due to a missing eager operator.

  Please refer to the changelog for full details of the changes, and Neo4j Release notes for all changes to other Neo4j products and services.  

Deprecations

• For all Cypher language changes, deprecations, and compatibility, see
  • Cypher 5 Manual -> Deprecations, additions, and compatibility.
  • Cypher 25 Manual -> Deprecations, additions, and compatibility