What does the hack mean for visitors and residents on Tenerife?
None of the reports checked mentions the Canary Islands. Spain and EU warning systems go unmentioned too, so a direct effect on Tenerife is not proven.
There is no new warning for the south of the island, from Playa de las Américas to Los Cristianos. Nor did the research find any Canarian or Spanish statement about hacked emergency apps.
If you use a warning app at home, check its alerts only through official channels. According to RPP, both sides in the war told their citizens to ignore suspicious alarms and not to open unknown links.
What happened in Ukraine and Russia?
On Sunday 1 November 2026, shortly before 23:00 local time, Ukraine's Air Alert app turned red, La Provincia reports. It showed warnings of nuclear attacks, radiation and street violence, including for Kyiv.
According to Meduza and RPP, one message in Russian said a nationwide nuclear alert was about to sound. People should not worry, it added, because the Oreshnik was coming (a Russian intermediate-range missile).
The Ukrainian air force told Meduza the app had been hacked and that there was no radiation danger. RPP quotes it more cautiously: the app may have been exposed to “hostile interference”.
The operators reported an “unauthorised intrusion”, Meduza says, and switched off notifications for the time being. In Lviv, La Provincia reports, radiation warnings even grew louder over loudspeakers.
During the night of 2 November, the app of Russia's Ministry of Emergency Situations sent false warnings, according to Meduza, UNN and RPP. They spoke of nuclear warheads “in all regions”, and UNN quotes a call to stock up for three weeks and hide in cellars.
The ministry spoke of a “massive cyberattack” in which hackers sent false information to the public. Sirens, television, radio and SMS, the main warning routes, were not affected, it said.
La Provincia says technicians were still working to bring the app back into service. The sources checked name no injuries, damage or outages beyond the apps.
Who is behind it?
Ukraine's Centre for Strategic Communications blamed Russian forces for the Air Alert hack, RPP reports. That is a claim, and no technical evidence has been shown.
The hacker group Atesh, which UNN describes as pro-Ukrainian, claimed the attack on the Russian app. UNN presents it as revenge for the incident in Ukraine, but this is not confirmed.
UNN stresses that nothing independent confirms the scale or the number of users reached. Kyiv has made no official statement on the Russian incident, the research found.
How does the warning system work in the Canary Islands?
ES-Alert, a tool of the National Civil Protection System, reaches every phone in an area via mobile cells. You need no app, no registration and no personal data.
The Gobierno de Canarias (the Canary Islands government) is in charge, through the Dirección General de Emergencias (the regional emergencies directorate) and the CECOES 112 emergency coordination centre. According to the research, a private app therefore cannot trigger a message.
Android 11 or newer and iOS 15.6 or newer have reception switched on by default. The phone needs network coverage and must not be in flight mode.
The authorities last tested the system on Tenerife on 22 October 2026, from 09:00 to 14:00, during the VOLCANEX Tenerife 2026 volcano exercise in Guía de Isora. Three test messages went out, and RTVC says the first reached all of Tenerife and possibly neighbouring islands.
What should you do when a warning appears on your phone?
According to the authorities' announcements, test messages carry the word “PRUEBA” (Spanish for test), along with a tone and vibration. You confirm them with “Aceptar”, and you should not call 112 for this.
Drivers should first stop safely. If your phone uses another language, the message may appear in English, so tell older relatives beforehand.
RTVC says ES-Alert has already sent real warnings during wildfires on La Palma and Tenerife and during storm “Therese”. The exact dates were not checked.
What is still unknown?
Who carried out the two hacks remains unclear, because no technical investigations have been published. The number of users reached is also missing.
The research did not find the original statements of the Russian ministry, the Ukrainian air force or the Air Alert operator. No dates for further announcements have been given.
The research found no figures on cyberattacks on warning systems in Spain or on the cost of ES-Alert. According to ORF and The Register, earlier cases occurred in February 2023, when hackers spread false air-raid alerts through Russian radio stations.