There are several recent vulnerabilities which could have resulted in your computer being infected with malware without you knowing (like the log4j vulnerability). Because you're storing your passwords in a KeePass vault this actually increases the platform size for attack. This could have taken the form of several fairly simple attacks, such as key logging, clipboard (copy & paste) sniffing and quite a few other methods of stealing your master password purely because you've stored it somewhere other than your brain. Given the number of reported events in recent days, this looks more like individual compromisation events (malware/viruses locally on each affected users computer) than a single large breach.
It's also entirely possible this is all is due to an entirely new vulnerability which hackers have uncovevered which the security community has not recognized yet. This is less likely, but whether it is the case or not doesn't change the fact this likes like a higher than average incident rate for indivual compromises, rather than a larger single event.
It's also entirely possible this is all is due to an entirely new vulnerability which hackers have uncovevered which the security community has not recognized yet. This is less likely, but whether it is the case or not doesn't change the fact this likes like a higher than average incident rate for indivual compromises, rather than a larger single event.