Naval Group Victim of Hacking and Data Leak

Summary:

In July 26 2025, Naval Group, France’s leading defense shipbuilder, suffered a major cybersecurity incident involving the leak of approximately 30 GB of internal data, with claims from the attackers that they possess up to 1 TB more. The exposed information allegedly includes technical documents and combat system files used in French submarines and warships, such as the Suffren-class nuclear submarines and FREMM frigates. While Naval Group stated that no intrusion into its IT infrastructure has been confirmed and operational systems remain unaffected, the breach is being treated as a reputational attack. A full investigation is underway in coordination with French authorities to assess the authenticity and impact of the leaked data.

Reference URL

https://www.bitdefender.com/en-us/blog/hotforsecurity/french-submarine-secrets-surface-after-cyber-attack
https://x.com/navalgroup/status/1949149936294998040/photo/2