The US Coast Guard and FBI boarded at least two foreign-flagged, US-bound oil tankers in the Gulf of Mexico — including the Liberian-flagged VL Prosperity — on August 21 and August 24, 2026, after detecting evidence that the vessels’ onboard networks had been compromised. Coast Guard Rear Adm. Amy Grable confirmed “evidence of a malicious cyber actor” on the ship’s IT/OT systems, though the Coast Guard has not attributed the intrusion to any state actor. A joint team of Coast Guard cyber specialists, a vessel inspector and an FBI Cyber Action Team spent four days aboard the VL Prosperity.
Iran’s Mehr News Agency separately reported that the VL Prosperity suffered a cyberattack on August 7 while transiting the Strait of Gibraltar, alleging the intrusion reached engine-room systems — altering coolant flow, engine speed and fuel delivery — and knocked out communications for roughly 30 hours; those specific technical claims have not been confirmed by the Coast Guard. Officials say there is no evidence the vessels operated unsafely, and the Coast Guard says it has conducted an estimated 40-50 similar cyber-related boardings over the past year.
Why it matters
Commercial vessels increasingly run networked engine, navigation and fuel-management systems that were not designed with the same threat model as IT networks — an attacker reaching those systems mid-voyage, even briefly, raises the kind of physical-safety stakes that a typical office network breach does not.
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