MISP v2.5.26 - released with performance improvements and interoperability fixes

| November 20, 2025

This release brings new features focused on performance improvements, logging enhancements, and data standardisation with the introduction of the UUID attribute type. It also includes several important bug fixes and dependency updates.

New Features

  • Event Linking with UUIDs: Added an option to prioritize creating event links using UUIDs instead of traditional IDs, where possible, improving consistency across distributed systems.
  • Performance Optimizations: Introduced new database indices to significantly enhance overall MISP performance.
  • JSON Syslog Support: A new option allows saving syslog messages in JSON format for better logging sanity and easier processing. (Fixes #10539).
  • UUID Attribute Type: Added a dedicated UUID attribute type to meet requirements from standards like FlowIntel and object templates, offering a better alternative to using text fields for unique identifiers.

⚙️ Changes & Updates

  • misp-stix Improvements: Updated misp-stix to feature better STIX 2 input handling. This update helps prevent issues when loading content or files that might contain an invalid STIX 2 format produced by some non-compliant TIP platforms.
  • Dependency Bumps: Updated numerous dependencies, including PyMISP, requirements.txt, and the requirement for taxii client version.
  • Object & Data Updates:
    • misp-object updated.
    • warning-lists updated to the latest version.
    • misp-taxonomies updated to the latest version.
    • misp-galaxy updated to the latest version.
    • misp-objects updated to the latest version.
  • Frontend Cleanup: Removed reference to the non-existing vis.map file in vis.js.

🛠️ Fixes

  • Security: Forced stronger cipher suites to be set as the default, enhancing security (reported by Jakub Tomaszewski of Zigrin Security).
  • Attribute Validation: Added validation for Attributes of type uuid.
  • Code Cleanup: Removed the use of eval from doT.js in favor of globalThis.
  • UI Fix: Corrected the event ID link in the side menu.
  • Object Enrichment Fixes: Several bugs in object enrichment have been fixed.

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