Only the latest release receives security fixes. There is no long-term support branch.

Please do not open a public issue for security vulnerabilities. Instead, email inna.stetsenko-fiot@edu.kpi.ua and sergey24rybak@gmail.com with:

• A description of the vulnerability and its potential impact
• Steps to reproduce (a minimal PNML file or code snippet, if applicable)
• The module affected (petri-math, petri-api, petri-model, petri-swing-ui, or petri-server)

We'll acknowledge your report and let you know whether it's accepted as a valid issue. Once a fix is available, we'll coordinate on disclosure timing with you before any public write-up.