A lot of modern interpretations of myths like these would say that these stories are already really messed up. Imprisonment, murder, attempted cannibalism, necrophilia.... these are pretty brutal themes.

Let's look at Snow White - the Grimm tales version, which is the source for all our modern interpretations. Snow White's stepmother is jealous of her beauty, so she sends her away to be killed (messed up point 1). She demands that after her death the huntsman remove SW's lungs and liver as proof (messed up point 2). Believing she has been brought these organs (swapped for those of a wild animal by the huntsman) the Queen EATS them (cannibalism - messed up point 3). A few attempted murders later and the Queen finally succeeds in putting SW into a coma - but everyone thinks she's dead. Whilst she is in the coffin (for a long time), a prince finds her and falls in love with her (creepy necrophilia - messed up point 4). He then barters with the dwarves to buy her dead, coffinned body (point 5). (The source for all this is just the original Grimm Tales: Snow White).

So, if you're asking whether the most popular sanitised versions (like Disney) have creepier predecessors - sure. The Grimm tales are... grim, like much traditional mythology. In particular, feminist interpretations of mythology of all kinds of societies in the 60s and 70s exposed a lot of the violence against women and girls in these tales ('The Second Sex' by Simone de Beauvoir is the classic text on this). It's kind of easy to gloss over the nasty cannibalistic/necrophiliac components of SW as a reader because, of course, everyone lives happily every after, but if you start to think about myths and fairy tales in this way, you don't have to look very far for rape (Sleeping Beauty, especially Basile's version where it's really explicit), cannibalism (Snow White, Hansel and Gretel - Grimm versions), necrophilia (Sleeping Beauty, Snow White - Grimm versions), child abduction (Hansel and Gretel).

As for more violent predecessors to these - it's possible of course. The Grimm brothers were recording tales that existed in oral tradition, which means they made decisions about what versions/elements to codify in their text. There are also many stories with parallels in global mythology, and with these kinds of traditions it's really hard to attribute origins or 'authentic' versions. John Foley's work on Oral-Formulaic Theory and Research is really important in explaining how different versions can develop in parallel, although I know this stuff more from ancient epic traditions (Iliad and Odyssey etc) so I am stretching my knowledge a bit here...

Sorry this isn't a complete answer for you - I'm not an expert in modern European fairytales, but I do know something about the interpretation of myths and their possible origins, which I hope has provided you with part of an answer here (mods, if this is not sufficient please go ahead and remove this, and apologies).