This yaml :

spring:
  redis:
    sentinel:
      master: mymaster
      nodes: "[2409:aaa:5a00::fdfb:1:aaa]:26379,[2409:80aaa50:5a00::fdfb:1:bbb]:26379,[2409:aaa:5a00::fdfb:1:ccc]:26379"

but fails with:

Caused by: java.lang.NumberFormatException: For input string: "aaa:5a00::fdfb:1:aaa]:26379"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[?:1.8.0_331]
    at java.lang.Integer.parseInt(Integer.java:580) ~[?:1.8.0_331]
    at java.lang.Integer.parseInt(Integer.java:615) ~[?:1.8.0_331]
    at org.springframework.boot.autoconfigure.data.redis.RedisConnectionConfiguration.createSentinels(RedisConnectionConfiguration.java:150) ~[spring-boot-autoconfigure-2.7.4.jar:2.7.4]
    at org.springframework.boot.autoconfigure.data.redis.RedisConnectionConfiguration.getSentinelConfig(RedisConnectionConfiguration.java:97) ~[spring-boot-autoconfigure-2.7.4.jar:2.7.4]

This issue is somewhat similar to #28133 and https://github.com/spring-projects/spring-data-redis/issues/2418#issue-1391878198

spring boot autoconfigure ipv6 address all split by ":"

private List<RedisNode> createSentinels(RedisProperties.Sentinel sentinel) {
        List<RedisNode> nodes = new ArrayList<>();
        for (String node : sentinel.getNodes()) {
            try {
                String[] parts = StringUtils.split(node, ":");
                Assert.state(parts.length == 2, "Must be defined as 'host:port'");
                nodes.add(new RedisNode(parts[0], Integer.parseInt(parts[1])));
            }
            catch (RuntimeException ex) {
                throw new IllegalStateException("Invalid redis sentinel property '" + node + "'", ex);
            }
        }
        return nodes;
    }