Fixable, (at least in OS depedencies) meant that, for a certain vulnerability in a version of a dependency, there exists a further version that fixes the vulnerability.
Because there is not always a fix available, Fixable can take different values:
No Fix Available : There does not exist any version that resolves the vulnerability.
Auto Fix Available : There exists a newer version of the dependency that fixes the vulnerability. Besides, it also means that Xygeni can automatically fix the vulnerability (visit Xygeni's Automatic Fix for further information)
Manual Fix Available : There exists a newer version of the dependency that fixes the vulnerability. In this case Xygeni's Automatic Fix is not possible due to different reasons (the fix entails a sequence of manual tasks, the package manager fix automation is not supported yet by Xygeni, etc...). In these cases, you should follow the provided recommendations to fix the vulnerability.