On Thursday, GM announced that it was issuing a voluntary recall on all 2023-2026 Corvette Z06s and 2025-2026 Corvette ZR1s over an excess fuel spillage issue that can happen during refueling.
Additionally, any 2025 and 2026 Corvette Z06s and ZR1s that are currently for sale at dealers were also issued a stop sale until the issue is resolved.

An official statement from a Chevy representative

General Motors is voluntarily recalling model year 2023-2026 Chevrolet Corvette Z06s and 2025-2026 Corvette ZR1s in North America to resolve an excess fuel spillage issue during refueling. This is a rare occurrence, and malfunctioning filling station pumps appear to be a contributing factor.

The safety of our customers is the highest priority for the entire GM team, and we’re working to remedy this matter as quickly as possible.

As for some background info, there is a document from the National Highway Traffic Safety Administration (posted below) that goes into more depth with the issue.
Excess fuel that spills into the vehicle’s fuel-filler pocket has the potential to contact an ignition source, leading to an increase risk of fire.
That NHTSA document says that dealers will install some sort of insert or shield to divert spilled fuel.

We spoke to a dealer about it tonight as one of his customer’s cars burned at a gas station. What he said is that the fans on the left side of the car will run even when the car is turned off, and if any gasoline that spills into the fuel-filler pocket and hits an ignition source like hot brake rotors, it can ignite the gasoline, leading to a car fire.

The Z06 & ZR1 are the only models currently being produced that have the left side radiator/fan set-up.
They are on the ZR1X as well, but that car hasn’t entered production yet, which is why this Recall/Stop-Sale doesn’t impact it

We also saw that GM thinks that malfunctioning or damaged pumps could also be to blame for excess fuel spillage. The NHTSA says never to overfill the tank or attempt to add more fuel after the pump’s automatic shutoff clicks the first time.

Looking at the production stats to see how many cars may be impacted from the recall.
For the ZR1, it’s only 108 for 2025 and no 2026s have been released from the plant yet.
But looking at over 25,000 Z06s subject to the voluntary recall. The 2025 and 2026 numbers are unofficial, but are probably close to these numbers:

2023 – 5,477
2024 – 10,575
2025 – 8,835 (unofficial)
2026 – 399 (unofficial)

Total: 25,286

Corvette owners that are subject to the recall will be notified when they have the proper fix for this issue in place,
You can also check the GM Recalls website for USA owners, or at GM Canada for those in the Great White North.