diff --git a/.build/parent-pom-template.xml b/.build/parent-pom-template.xml
index 6e12bf0129..c2b23a4ca9 100644
--- a/.build/parent-pom-template.xml
+++ b/.build/parent-pom-template.xml
@@ -427,27 +427,27 @@
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-core</artifactId>
-        <version>2.13.2</version>
+        <version>2.15.3</version>
       </dependency>
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-databind</artifactId>
-        <version>2.13.2.2</version>
+        <version>2.15.3</version>
       </dependency>
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-annotations</artifactId>
-        <version>2.13.2</version>
+        <version>2.15.3</version>
       </dependency>
       <dependency>
         <groupId>com.fasterxml.jackson.datatype</groupId>
         <artifactId>jackson-datatype-jsr310</artifactId>
-        <version>2.13.2</version>
+        <version>2.15.3</version>
       </dependency>
       <dependency>
         <groupId>com.fasterxml.jackson.dataformat</groupId>
         <artifactId>jackson-dataformat-yaml</artifactId>
-        <version>2.13.2</version>
+        <version>2.15.3</version>
         <scope>test</scope>
         <exclusions>
           <exclusion>
@@ -469,7 +469,7 @@
       <dependency>
         <groupId>org.yaml</groupId>
         <artifactId>snakeyaml</artifactId>
-        <version>1.26</version>
+        <version>2.1</version>
       </dependency>
       <dependency>
         <groupId>junit</groupId>
diff --git a/CHANGES.txt b/CHANGES.txt
index 1e690b42cb..a8c465c72a 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,6 @@
 5.1
  * Make nodetool tablestats use number of significant digits for time and average values consistently (CASSANDRA-19015)
+ * Upgrade jackson to 2.15.3 and snakeyaml to 2.1 (CASSANDRA-18875)
  * Transactional Cluster Metadata [CEP-21] (CASSANDRA-18330)
  * Add ELAPSED command to cqlsh (CASSANDRA-18861)
  * Add the ability to disable bulk loading of SSTables (CASSANDRA-18781)
diff --git a/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java b/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java
index edff7be8ec..a312aa47dd 100644
--- a/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java
+++ b/src/java/org/apache/cassandra/config/YamlConfigurationLoader.java
@@ -52,6 +52,8 @@ import org.yaml.snakeyaml.introspector.MissingProperty;
 import org.yaml.snakeyaml.introspector.Property;
 import org.yaml.snakeyaml.introspector.PropertyUtils;
 import org.yaml.snakeyaml.nodes.Node;
+import org.yaml.snakeyaml.parser.ParserImpl;
+import org.yaml.snakeyaml.resolver.Resolver;
 
 import static org.apache.cassandra.config.CassandraRelevantProperties.ALLOW_DUPLICATE_CONFIG_KEYS;
 import static org.apache.cassandra.config.CassandraRelevantProperties.ALLOW_NEW_OLD_CONFIG_KEYS;
@@ -195,7 +197,7 @@ public class YamlConfigurationLoader implements ConfigurationLoader
 
     private static void verifyReplacements(Map<Class<?>, Map<String, Replacement>> replacements, byte[] configBytes)
     {
-        LoaderOptions loaderOptions = new LoaderOptions();
+        LoaderOptions loaderOptions = getDefaultLoaderOptions();
         loaderOptions.setAllowDuplicateKeys(ALLOW_DUPLICATE_CONFIG_KEYS.getBoolean());
         Yaml rawYaml = new Yaml(loaderOptions);
 
@@ -222,14 +224,7 @@ public class YamlConfigurationLoader implements ConfigurationLoader
         constructor.setPropertyUtils(propertiesChecker);
         Yaml yaml = new Yaml(constructor);
         Node node = yaml.represent(map);
-        constructor.setComposer(new Composer(null, null)
-        {
-            @Override
-            public Node getSingleNode()
-            {
-                return node;
-            }
-        });
+        constructor.setComposer(getDefaultComposer(node));
         T value = (T) constructor.getSingleData(klass);
         if (shouldCheck)
             propertiesChecker.check();
@@ -256,18 +251,23 @@ public class YamlConfigurationLoader implements ConfigurationLoader
         constructor.setPropertyUtils(propertiesChecker);
         Yaml yaml = new Yaml(constructor);
         Node node = yaml.represent(map);
-        constructor.setComposer(new Composer(null, null)
+        constructor.setComposer(getDefaultComposer(node));
+        T value = (T) constructor.getSingleData(klass);
+        if (shouldCheck)
+            propertiesChecker.check();
+        return value;
+    }
+
+    private static Composer getDefaultComposer(Node node)
+    {
+        return new Composer(new ParserImpl(null), new Resolver(), getDefaultLoaderOptions())
         {
             @Override
             public Node getSingleNode()
             {
                 return node;
             }
-        });
-        T value = (T) constructor.getSingleData(klass);
-        if (shouldCheck)
-            propertiesChecker.check();
-        return value;
+        };
     }
 
     @VisibleForTesting
@@ -275,7 +275,7 @@ public class YamlConfigurationLoader implements ConfigurationLoader
     {
         CustomConstructor(Class<?> theRoot, ClassLoader classLoader)
         {
-            super(theRoot, classLoader);
+            super(theRoot, classLoader, getDefaultLoaderOptions());
 
             TypeDescription seedDesc = new TypeDescription(ParameterizedClass.class);
             seedDesc.putMapPropertyType("parameters", String.class, String.class);
@@ -426,5 +426,12 @@ public class YamlConfigurationLoader implements ConfigurationLoader
                 logger.warn("{} parameters have been deprecated. They have new names and/or value format; For more information, please refer to NEWS.txt", deprecationWarnings);
         }
     }
+
+    public static LoaderOptions getDefaultLoaderOptions()
+    {
+        LoaderOptions loaderOptions = new LoaderOptions();
+        loaderOptions.setCodePointLimit(64 * 1024 * 1024); // 64 MiB
+        return loaderOptions;
+    }
 }
 
diff --git a/src/java/org/apache/cassandra/tools/JMXTool.java b/src/java/org/apache/cassandra/tools/JMXTool.java
index 8cf5748a2e..3e2fab5b3b 100644
--- a/src/java/org/apache/cassandra/tools/JMXTool.java
+++ b/src/java/org/apache/cassandra/tools/JMXTool.java
@@ -68,9 +68,11 @@ import io.airlift.airline.Command;
 import io.airlift.airline.Help;
 import io.airlift.airline.HelpOption;
 import io.airlift.airline.Option;
+import org.apache.cassandra.config.YamlConfigurationLoader;
 import org.apache.cassandra.io.util.File;
 import org.apache.cassandra.io.util.FileInputStreamPlus;
 import org.apache.cassandra.utils.JsonUtils;
+import org.yaml.snakeyaml.DumperOptions;
 import org.yaml.snakeyaml.TypeDescription;
 import org.yaml.snakeyaml.Yaml;
 import org.yaml.snakeyaml.constructor.Constructor;
@@ -163,7 +165,7 @@ public class JMXTool
             {
                 void dump(OutputStream output, Map<String, Info> map) throws IOException
                 {
-                    Representer representer = new Representer();
+                    Representer representer = new Representer(new DumperOptions());
                     representer.addClassTag(Info.class, Tag.MAP); // avoid the auto added tag
                     Yaml yaml = new Yaml(representer);
                     yaml.dump(map, new OutputStreamWriter(output));
@@ -394,6 +396,7 @@ public class JMXTool
 
             public CustomConstructor()
             {
+                super(YamlConfigurationLoader.getDefaultLoaderOptions());
                 this.rootTag = new Tag(ROOT);
                 this.addTypeDescription(INFO_TYPE);
             }
diff --git a/tools/stress/src/org/apache/cassandra/stress/StressProfile.java b/tools/stress/src/org/apache/cassandra/stress/StressProfile.java
index cc668b5ad4..598a4f327a 100644
--- a/tools/stress/src/org/apache/cassandra/stress/StressProfile.java
+++ b/tools/stress/src/org/apache/cassandra/stress/StressProfile.java
@@ -37,6 +37,7 @@ import com.google.common.util.concurrent.Uninterruptibles;
 import com.datastax.driver.core.*;
 import com.datastax.driver.core.exceptions.AlreadyExistsException;
 import org.antlr.runtime.RecognitionException;
+import org.apache.cassandra.config.YamlConfigurationLoader;
 import org.apache.cassandra.cql3.CQLFragmentParser;
 import org.apache.cassandra.cql3.CqlParser;
 import org.apache.cassandra.cql3.statements.ModificationStatement;
@@ -809,7 +810,7 @@ public class StressProfile implements Serializable
     {
         try
         {
-            Constructor constructor = new Constructor(StressYaml.class);
+            Constructor constructor = new Constructor(StressYaml.class, YamlConfigurationLoader.getDefaultLoaderOptions());
 
             Yaml yaml = new Yaml(constructor);