French supermarket chains faced widespread food losses after a cyberattack disrupted connected refrigeration systems at hundreds of stores overnight on 11–12 October 2026, according to retailers and the Paris prosecutor’s office.

Intermarché and Coopérative U confirmed the incident on 12 October. Their initial statements put the impact at roughly 150–200 Intermarché stores and almost 100 Coopérative U outlets. Later reports indicated that the wider total, including Netto and other chains, was higher. The figures remain provisional while retailers assess damage.

Attackers reportedly interfered with the controls that regulate defrost cycles and temperatures in supermarket refrigerators and freezers. In some affected stores, temperatures rose sharply, requiring operators to remove fresh and frozen products that could no longer be considered safe for sale. Prosecutors also reported fires associated with the incident.

The disruption goes beyond an IT outage. Stores depend on refrigeration to maintain food safety from delivery to sale. Once temperature control is lost, staff must identify affected stock, check records and withdraw products if their safety cannot be assured. Reopening a cabinet does not automatically make its remaining food suitable for sale.

Les Mousquetaires, which operates Intermarché, told reporters that affected stores had to discard compromised goods. Coopérative U chief executive Dominique Schelcher condemned the targeting of equipment essential to preserving food and said teams were working to restore operations.

For supermarket buyers and food suppliers, the immediate questions include which product categories need replacement, whether refrigerated storage has been restored, and how quickly fresh and frozen deliveries can resume. Emergency replenishment may place additional pressure on depots, hauliers and producers while routine orders continue.

Food losses could also generate disputes over responsibility and insurance. Intermarché raised concerns that some existing policies might not cover this kind of store-level incident. No reliable final value of destroyed stock or sector-wide insurance exposure had been established by the first reports.

The incident has also drawn attention to cybersecurity in connected refrigeration equipment. Reporting has identified older control software and possible third-party vulnerabilities as areas of investigation, but GTN is not treating any specific attack route or vendor as conclusively responsible before the authorities complete their work.

French authorities have opened an investigation, while national cybersecurity officials are examining the wider risk. Some additional retailers, including E.Leclerc, Carrefour Market and Monoprix, have been mentioned in media reports, but their precise exposure must be distinguished from the initially confirmed figures.

GTN’s overview of supermarket refrigeration companies in France examines the equipment and service infrastructure on which the country’s major grocers depend.

The next operational priority for retailers is safe restoration of refrigeration, assessment of losses and replenishment of affected food ranges. Investigators must also establish how the systems were accessed and whether similar equipment elsewhere remains exposed.

Editor’s note: Coopérative U president Dominique Schelcher confirmed disruption to refrigeration systems on 12 October 2026. Affected-store counts and the investigation remain subject to change. The featured refrigeration image is illustrative, not a photograph of the incident.