GraphQL Java (aka graphql-java) before 21.5 does not properly consider ExecutableNormalizedFields (ENFs) as part of preventing denial of service via introspection queries. 20.9 and 19.11 are also fixed versions.
https://github.com/graphql-java/graphql-java/releases/tag/v21.5
https://github.com/graphql-java/graphql-java/releases/tag/v20.9
https://github.com/graphql-java/graphql-java/releases/tag/v19.11
https://github.com/graphql-java/graphql-java/pull/3539
https://github.com/graphql-java/graphql-java/discussions/3641
https://github.com/graphql-java/graphql-java/commit/97743bc1b5caa2b0bd894dc8e128b47e4d771e4a