Hackers Claim 30 GB Leak from French Submarine Builder Naval Group
French defence contractor Naval Group is investigating an alleged cyber attack after criminals published what they say is classified source code for submarine and frigate weapon systems. The company, majority‑owned by the French state, said it has launched urgent technical inquiries but has so far detected no breach of its internal networks.
Dark‑web ultimatum
Late last week an unknown group posted on a dark‑web forum, asserting that it had extracted “top‑secret” data linked to the Barracuda class of nuclear‑powered submarines and other naval platforms. The hackers released about 30 gigabytes of files as proof and threatened to dump far more unless Naval Group made contact within 72 hours. Early samples appear to include software code for combat‑management modules, although the authenticity has not yet been verified.
Company response
A Naval Group spokesperson described the incident as a reputational attack rather than a confirmed intrusion, adding that all available resources are now focused on tracing the origin and ownership of the leaked data. The shipbuilder reported no disruption to shipyard operations or ongoing naval programmes. French government cyber officials are understood to be assisting with the forensic review, but the defence ministry has declined public comment.
Strategic stakes
Naval Group designs and maintains France’s most sensitive maritime assets, from the Charles de Gaulle aircraft carrier to the Triomphant‑class ballistic‑missile submarines. Any compromise of design blueprints or command software could weaken national security and jeopardise export contracts with allies such as Australia, India and Brazil. Cyber experts note that even partial source‑code exposure can give adversaries insights into weapons performance and potential vulnerabilities.
Growing wave of defence breaches
The incident follows a string of recent cyber intrusions targeting military suppliers. Earlier this month Microsoft disclosed a flaw in its SharePoint service that was exploited by threat actors linked to China, while US nuclear oversight agencies have also reported attempted breaches. Analysts warn that defence ecosystems, with their complex webs of subcontractors, remain attractive targets for ransomware gangs and state‑sponsored hackers seeking geopolitical leverage.
Next steps
Naval Group says it will continue to monitor dark‑web channels and cooperate with French authorities. If the leaked material is confirmed genuine, the company could face export‑control probes and extensive code reviews across its submarine fleet. For now, the shipbuilder maintains that its production and maintenance schedules remain unaffected, but the countdown on the hackers’ ultimatum underscores the urgency of its investigation.
Photo Credit: DepositPhotos.com