I had this 8700k in my Work PC since I got it a few years ago. Only had a mild OC on it (no more than 4.9ghz)
Last week I noticed high voltage around 1.43 on the vcore.
Today I removed all Overclocks and Asus MCE still disabled I see the CPU pulling 1.39 to 1.42v at stock settings (Asus Maximus Hero X wifi M.b)
What the heck??? could this be powersupply related or just a bad silicon lottery cpu just degrading with a very little overclock since day 1.
PSU Is a Corsair HXI 1200.
Are you sure you’re not reading vid?
Also, how do you have voltage set, dynamic, fixed, or auto?
How are you reading this? Hwinfo64?
Do you have a VR-OUT sensor? Apparently that’s the one to go by, if you have it. And the normal Vcore sensors aren’t that accurate.
I noticed after an update on Hwinfo64 a few weeks ago my “maximum” voltage was reading higher than I’d ever been, even though nothing changed.
My voltage is set to fixed 1.38v, but sometimes I see the “maximum” to spike as high as 1.46v, despite averages bring around 1.37-1.39.
I think something changed in that software or some microcode somewhere so it just reads more sensitivity.
The spikes only ever happen during idle, so I’m not worried because there’s no load on it and thus no current.
For degradation, you need voltage, current, AND heat.
If these are just idle spikes i wouldn’t worry. If it’s always that high, then that’s a problem.
Usually on stock settings, it won’t automatically go that high to get stability, it will just crash at lower voltage.
Pretty sure it’s vcore.
I removed all the overclock settings and manual settings which before was 1.35v but now it’s all on Auto.
I am seeing this voltage in ICUE and also Hwinfo. I see CORE 0 and CORE 1 usually spike to 1.4x but the others hover to around 1.35+. used to see them around 1.26 and 1.27 with no overclock.
Have you updated BIOS recently at all?
I believe I did a few months ago but not recently I can def look for a new one.
Here is a snapshot of hwinfo just now. ON my work pc, not gaming just browsers open RDP manager CPUID, Teams. typical office apps 
CPU load is really low though.
https://imgur.com/a/bVB9zqo
Those are VID - they are what the CPU is asking for, not specifically what they are receiving from the motherboard.
Look for a sensor under the motherboard with sensors that have number names:
Here is mine:
https://i.imgur.com/OtgGxt0.png
These aren’t measured very well though and still your best bet is VR OUT sensor (my motherboard does not have) but keep in mind VID isn’t the same as the voltage they’re getting. You can safely ignore VID.
Here is someone else’s VR OUT sensor from reddit:
As you can see from their sensors, the VROUT (more accurate) is much lower than even the VCORE sensor from that part of the motherboard.
Oops forgot to include the vcore image.
https://imgur.com/qcs32m4
That’s not crazy but is a bit high - do you have a VROUT sensor?
I looked but do not see one there for this board. I will look for a bios update. Thank you!
I don’t know if you need to update the bios
maybe clear the cmos first
EDIT: We look too much alike. I feel like I’m having a convo with myself lol
I will try that , I looked for a new bios but looks like im running the latest one posted 2503 according to ASUS website
Well I cleared CMOS , here are the results 
Thank you!!! At peak it’s only going up to 1.25v