🔍 Read the full analysis: The Night A Hacker's 110 °C Setting Met A Blood Bank's Alarm on ThorstenMeyerAI.com
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TL;DR
France’s national blood service, the EFS, said a cybersecurity incident involving a refrigeration contractor affected cold-room control systems at three sites overnight on Nov. 1–2. The EFS says alarms detected the changes, staff moved the plasma, and no health impact or loss of blood products was reported. A reported 110 °C value was a controller setting, not a measured room temperature.
France’s national blood service said a cybersecurity incident involving a refrigeration contractor altered cold-room control settings at three EFS sites overnight from Nov. 1 to Nov. 2, prompting alarms and the precautionary transfer of stored plasma. The EFS said on Nov. 3 that it had identified no health impact and no loss of blood products; a widely reported 110 °C figure was a programmed setting, not a temperature measured in the rooms.
The EFS said the incident affected supervision and control installations for cold rooms at three of its sites. The rooms held plasma intended for transfusion and plasma destined for fractionation, a process used to make medicines. The service said temperature and defrost thresholds had been raised to very high values, but its public statement did not specify the 110 °C figure reported elsewhere.
According to the EFS statement, its monitoring and alarm systems detected the anomalies quickly. Equipment was brought under control or switched off, and the contents were moved to other facilities as a precaution. The service said it had increased temperature monitoring across its equipment and that technical teams were working with France’s national cybersecurity agency, ANSSI, and the health ministry.
Le Canard enchaîné reported that rooms normally set to −30 °C had been programmed to +110 °C and named the contractor as Coolworld. That identification has not been confirmed by the EFS, which did not name the contractor in its statement; Coolworld had not publicly commented in the material available for this report. The EFS said it was not directly targeted, according to the source account.
Infographic 01 · 110 °C, explained
A setting, not a temperature
Someone raised the targets of plasma cold rooms at France’s blood service to +110 °C. The rooms never got there. What mattered was the alarm.
Frozen plasma has to stay at or below this line. The danger was thawing, not boiling. A few degrees too warm can already mean discarding bags.
- +110 °CThe programmed setpointTyped into the controller (Canard). Never reached, never measured.
- ~+50 °CHottest reported in the supermarket waveDefrost heaters forced on, same night (AFP, ZDFheute)
- −25 °CThe line that mattersFrozen plasma is stored at −25 °C or colder (EDQM guide via ISBT)
- −30 °CNormal operation of the EFS cold roomsAs reported by Le Canard enchaîné
Why the alarm won
- DetectionEFS monitoring and alarms flagged the anomaly quickly (EFS)
- A person on callAn on-call technician saw the temperature rise in the night (Canard)
- A plan BThe plasma was moved to other installations as a precaution (EFS)
Sources: EFS communiqué, 3 Nov 2026, via franceinfo · Le Canard enchaîné, as reported by Solutions Numériques · ISBT, citing the EDQM Guide · AFP via Al Jazeera, 4 Nov · ZDFheute, 3 Nov. The 110 °C and −30 °C figures come only from Le Canard enchaîné; the EFS gives no number.
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Why Plasma Storage Was at Risk
Plasma must remain frozen to preserve its suitability for use. European guidance summarized by the International Society of Blood Transfusion says fresh frozen plasma should be stored at −25 °C or colder. The concern in this incident was that altered controls could trigger warming or defrosting and put stored products at risk—not that plasma reached 110 °C.
The case also shows how a failure in a contractor’s remote access or control environment can affect healthcare infrastructure. In this instance, the EFS says its separate monitoring and alarm systems helped staff act, and the stock was transferred before any loss was reported. That outcome does not establish how the intrusion occurred or whether the same protections would be sufficient in a longer or wider outage.
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The Reported 110 °C Setting
The 110 °C figure spread online alongside descriptions of “boiled blood.” The source material says that interpretation is incorrect: it was a controller setpoint, or target value, not a recorded temperature. No source in the material reports that the cold rooms reached anything close to 110 °C. A programmed value and a measured room temperature are different facts.
The incident took place on the same night as a second wave of reported attacks affecting supermarket refrigeration in at least 11 European countries. The source material says no authority has linked the blood-service incident to those attacks. Two groups describing themselves as pro-Russian later claimed the supermarket attacks in video posts, according to the source account, but those claims are unverified, the posts were deleted, and no government attribution was reported. Similar timing alone does not establish a connection.
“The EFS monitoring and alarm systems made it possible to identify these anomalies quickly.”
— Établissement français du sang, statement issued Nov. 3
Intrusion Details Still Missing
The EFS has not publicly named the refrigeration contractor or identified the method used to access its systems. The attribution of the contractor to Coolworld comes from Le Canard enchaîné, as relayed by other outlets, and was not confirmed in the EFS statement. The EFS has also not publicly identified two of the three affected sites; Bourgogne-Franche-Comté was named in the reporting cited by the source material.
It remains unclear what temperature the rooms actually reached, how long the altered settings were active, and what exact control changes were made. The available statements do not establish who carried out the intrusion, whether data or other systems were affected, or whether this incident was related to the supermarket attacks. The EFS reports no product loss or health impact, but details of any technical investigation have not been published in the source material.
EFS Review and Monitoring
The EFS said technical teams are working with ANSSI and the health ministry and that temperature monitoring across its equipment has been stepped up. The service has not announced a public timetable for the investigation or further technical findings.
Further clarity may depend on the EFS naming the contractor and sites, or on investigators releasing information about the access route and safeguards. Until then, the confirmed account is limited: control settings were altered at three sites, alarms detected anomalies, staff moved the plasma, and the EFS reported no health impact or loss of blood products.
Key Questions
Did a blood bank’s plasma actually reach 110 °C?
No. The 110 °C figure was reported as a programmed controller setting. The source material contains no report that any room measured that temperature.
Was any plasma lost or were patients harmed?
The EFS said it had identified no health impact and no loss of blood products. It said the stored contents were moved to other facilities as a precaution.
Which sites were affected?
The EFS confirmed that cold-room control installations at three sites were affected but did not name them in its statement. Reporting cited in the source material identified Bourgogne-Franche-Comté; the other two sites were not public.
Who was responsible for the incident?
The responsible party has not been identified publicly in the source material. Le Canard enchaîné named Coolworld as the contractor, but the EFS did not name its contractor, and no perpetrator attribution was reported.
Was this connected to the supermarket refrigeration attacks?
No connection has been established. The incidents occurred on the same night, but the source material says no authority has linked them; claims by groups about the supermarket attacks remain unverified.
Source: ThorstenMeyerAI.com
