- May 14 - Abrigo - 711,099 breached accounts
- May 13 - Canada Life - 237,810 breached accounts
- May 12 - Cushman & Wakefield - 310,431 breached accounts
- May 08 - Zara - 197,376 breached accounts
- May 07 - Woflow - 447,593 breached accounts
- May 17 - Playing Atari ST Music on the Amiga with Zero CPU
- May 17 - Mozilla to UK regulators: VPNs are essential privacy and security tools
- May 17 - Grafana Labs internal source code accessed
- May 17 - Hosting a website on an 8-bit microcontroller
- May 17 - Self-Distillation Enables Continual Learning [pdf]