A potential cyberattack targeting France’s Naval Group could have massive implications for national security, defense alliances and the global balance of military power, as hackers claim to have obtained highly classified data tied to the country’s nuclear submarine fleet.
The state-owned defense contractor, which builds and maintains France’s most sensitive naval assets, including the Barracuda-class nuclear-powered submarines, said it had “immediately launched technical investigations” after cyber criminals threatened to leak files on the dark web.
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In a chilling post online, the attackers claimed they had uncovered “top-secret classified” data concerning “submarines and frigates.” Among the material allegedly already released are source codes for submarine weapon systems, potentially opening the door for adversaries to study, replicate or even compromise France’s undersea military capabilities.
So far, hackers have published approximately 30 gigabytes of files, claiming to possess even more. They gave Naval Group 72 hours to respond.
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While Naval Group insists “no intrusion into our IT environments has been detected,” the scope of the data already exposed, if verified, would signal a catastrophic breach. “Naval Group has noticed being the target of a reputational attack with the claim of a cyber-malice act,” a spokesman said. “All teams and resources are currently mobilized to analyze and verify the authenticity, origin and ownership of the data as quickly as possible.”
The company added, “There has been no impact on our activities,” suggesting operations remain stable for now.
Still, the stakes are high. If authentic, leaked source codes could allow hostile foreign powers to reverse-engineer sensitive military technology, expose vulnerabilities in French naval systems, or develop countermeasures that could nullify France’s strategic edge at sea. This event could also compromise the deterrence value of the nuclear fleet, affecting France’s standing within NATO and its ability to project force independently.
This breach also raises troubling questions about cybersecurity protocols within Europe’s leading military contractors. Naval Group, which traces its legacy back to the 17th century, employs more than 15,000 people and reported revenues of more than €4.4 billion. It is majority-owned by the French government, with the remainder held by defense conglomerate Thales.
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The timing of the attack coincides with a broader surge in cyberwarfare incidents. Just last week, Microsoft disclosed a significant flaw in its SharePoint system that was exploited by hackers reportedly tied to China. Among the agencies impacted was the U.S. National Nuclear Security Administration.
While investigations into the Naval Group breach are ongoing, the possibility that foreign adversaries now possess highly sensitive French defense data, even if unconfirmed, has rattled security observers. As more details emerge, the world will be watching to see just how deep the damage may go.
James Lasher is staff writer for Charisma Media.











