French supermarkets suffer massive food loss after cyber‑attack disables refrigeration

Incident overview During the night of 11 October 2026, a sophisticated cyber intrusion targeted the temperature‑control software used by a large number of French grocery outlets. The attack caused refrigeration units to rise to temperatures as high as 50 °C, far above normal operating levels. In at least one Intermarché store in La Haye, internal fridges reached around 27 °C, leading to the loss of both fresh and frozen products.

Scale of the disruption The breach affected roughly four hundred retail locations, according to figures released by the chains involved. More than one hundred stores belonging to the Coopérative U network reported being hit, while the Intermarché group, including its Netto brand, saw around 180 outlets compromised. An additional one hundred shops were taken offline as a precautionary measure to stop the malware from spreading further. Other major French retailers such as Carrefour, Monoprix and E.Leclerc also experienced the intrusion, although the exact number of their affected sites was not disclosed.

Financial and operational impact The temperature rise rendered perishable stock unsellable, with losses estimated in the millions of euros across the affected chains. Store managers described the event as an unprecedented and serious incident, noting that the sudden heating of freezers went beyond the brief, normal defrost cycles that typically occur overnight. The loss of fresh and frozen goods forced many supermarkets to apologise to customers and to discard large quantities of inventory.

Technical cause and industry response Investigations identified the software that controls the refrigeration units as being supplied by Danish engineering firm Danfoss. The compromised systems were older models whose security patches could not be applied, leaving them vulnerable to the attack. Danfoss confirmed that the affected units were not up to date with the latest security recommendations and reiterated its long‑standing advice for retailers to maintain supported software versions. The firm also emphasised its commitment to helping customers secure and stabilise their cold‑chain infrastructure.

Wider implications The incident highlights the growing risk that cyber threats pose to essential food‑supply chains. Reliable refrigeration is critical for preserving perishable items, and the breach demonstrates how a single software vulnerability can cascade into widespread food waste and financial loss. Retailers are now reviewing their digital security strategies, and industry bodies are urging faster adoption of updated control systems to mitigate similar threats in the future.