File: src/main/java/com/fasterxml/jackson/databind/deser/BeanDeserializerFactory.java
Issue: Jackson Deserializer security vulnerability via default typing (CVE-2017-7525)
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Buggy code:
@Override
    public JsonDeserializer<Object> createBeanDeserializer(DeserializationContext ctxt,
            JavaType type, BeanDescription beanDesc)
        throws JsonMappingException
    {
        final DeserializationConfig config = ctxt.getConfig();
        // We may also have custom overrides:
        JsonDeserializer<Object> custom = _findCustomBeanDeserializer(type, config, beanDesc);
        if (custom != null) {
            return custom;
        }
        /* One more thing to check: do we have an exception type
         * (Throwable or its sub-classes)? If so, need slightly
         * different handling.
         */
        if (type.isThrowable()) {
            return buildThrowableDeserializer(ctxt, type, beanDesc);
        }
        /* Or, for abstract types, may have alternate means for resolution
         * (defaulting, materialization)
         */
        // 29-Nov-2015, tatu: Also, filter out calls to primitive types, they are
        //    not something we could materialize anything for
        if (type.isAbstract() && !type.isPrimitive()) {
            // Let's make it possible to materialize abstract types.
            JavaType concreteType = materializeAbstractType(ctxt, type, beanDesc);
            if (concreteType != null) {
                /* important: introspect actual implementation (abstract class or
                 * interface doesn't have constructors, for one)
                 */
                beanDesc = config.introspect(concreteType);
                return buildBeanDeserializer(ctxt, concreteType, beanDesc);
            }
        }

        // Otherwise, may want to check handlers for standard types, from superclass:
        @SuppressWarnings("unchecked")
        JsonDeserializer<Object> deser = (JsonDeserializer<Object>) findStdDeserializer(ctxt, type, beanDesc);
        if (deser != null) {
            return deser;
        }

        // Otherwise: could the class be a Bean class? If not, bail out
        if (!isPotentialBeanType(type.getRawClass())) {
            return null;
        }
        // For checks like [databind#1599]
        // Use generic bean introspection to build deserializer
        return buildBeanDeserializer(ctxt, type, beanDesc);
    }

Fixed code:
@Override
    public JsonDeserializer<Object> createBeanDeserializer(DeserializationContext ctxt,
            JavaType type, BeanDescription beanDesc)
        throws JsonMappingException
    {
        final DeserializationConfig config = ctxt.getConfig();
        // We may also have custom overrides:
        JsonDeserializer<Object> custom = _findCustomBeanDeserializer(type, config, beanDesc);
        if (custom != null) {
            return custom;
        }
        /* One more thing to check: do we have an exception type
         * (Throwable or its sub-classes)? If so, need slightly
         * different handling.
         */
        if (type.isThrowable()) {
            return buildThrowableDeserializer(ctxt, type, beanDesc);
        }
        /* Or, for abstract types, may have alternate means for resolution
         * (defaulting, materialization)
         */
        // 29-Nov-2015, tatu: Also, filter out calls to primitive types, they are
        //    not something we could materialize anything for
        if (type.isAbstract() && !type.isPrimitive()) {
            // Let's make it possible to materialize abstract types.
            JavaType concreteType = materializeAbstractType(ctxt, type, beanDesc);
            if (concreteType != null) {
                /* important: introspect actual implementation (abstract class or
                 * interface doesn't have constructors, for one)
                 */
                beanDesc = config.introspect(concreteType);
                return buildBeanDeserializer(ctxt, concreteType, beanDesc);
            }
        }

        // Otherwise, may want to check handlers for standard types, from superclass:
        @SuppressWarnings("unchecked")
        JsonDeserializer<Object> deser = (JsonDeserializer<Object>) findStdDeserializer(ctxt, type, beanDesc);
        if (deser != null) {
            return deser;
        }

        // Otherwise: could the class be a Bean class? If not, bail out
        if (!isPotentialBeanType(type.getRawClass())) {
            return null;
        }
        // For checks like [databind#1599]
        checkIllegalTypes(ctxt, type, beanDesc);
        // Use generic bean introspection to build deserializer
        return buildBeanDeserializer(ctxt, type, beanDesc);
    }