He has 9 or 10.
On the official FIFA page, he has the record for scoring the most contributions , goals + assists in the final match. 3 goals and 3 assists.
2 goals and 1 assist Vs Sweden in 1958 and 1 goal with 2 assists Vs Italy in 1970.
https://www.fifa.com/fifaplus/en/tournaments/mens/worldcup/articles/a-tribute-to-pele-brazil-santos-new-york-cosmos-legend-fifa-world-cup
So in 1958, it's 2 assists, 1 Vs USSR and 1 Vs Sweden.
Then, he made 1 more assist in 1962 Vs Mexico, his solo run goals dribbling 4-5 mexican players + his beautiful assist.
And in 1970 he made 6 assists (Most of anyone in one competition) or 7 assists, according to FIFA website it was 6. But on some websites it was 7, one assist is still debated
So, 2(1958) + 1(1962) + 6 or 7 (1970). You can choose, because FIFA, IFFHS and Opta still have differences in interpreting an assist.
Edit : FIFA has not made a statement about Pele's total number of assists. However, after I explored the official FIFA website along with videos of Brazil's goals between 1958-1970 in the World Cup.
I see Pele has a record of 6 assists in knockout stages. Most (shared with Messi).
This is confirmed from the official FIFA website : https://www.fifa.com/fifaplus/en/articles/lionel-messi-fifa-world-cup-records-milestones-argentina-appearances-assists-goals
But after I counted, if 6 total in the knock-out stage, then that's exactly 10 assists.
In group stages, Pele made 1 V USSR (1958), 1 V Mexico(1962) and 2 vs England (for jair) and Czechoslovakia in 1970. So group stages 4 in totals.
In the knockout stages? There are 6 according to FIFA, and after looking at previous data, I only found 5 assist in total. 1 Vs Sweden (1958), 4 in 1970 ( 1 Vs Peru, 1 Vs Uruguay, 2 vs Italy). So where does another one come from... I finally decided to look at the 1958 WC video.
Against Wales, it was impossible, because Pele scored the only goal of the match.
So it's probably Brazil vs France. Pele scores 3 goals from total 5 Brazil's goals. This has to be a Vava or Didi goal. And finally I found video footage of Didi's goal, the ball from Pele's deflected pass, which Didi grabbed and he shot a long-range shot. This is Pele's 6th assist What we have been looking for in the knock-out stage.
So 10, 4 from groups stages and 6 from knockout stages