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AWS managedservices medium security documentation change

Service: managedservices · 2026-05-04 · Security-related medium

File: managedservices/latest/ctref/schemas.md

Summary

Added three new change type schemas: Create Prefix List (ct-1bw3q0obl5y75), Modify Prefix List (ct-2s1q5tjl0416n), and Delete Prefix List (ct-3fh88p7t5k5gi). Updated the change type ID list to include these new entries.

Security assessment

The added schemas document security features related to prefix list management. Prefix lists are critical security components used in VPC security groups and route tables to control network access. The schemas include security validation patterns that prevent reserved naming conventions ('aws:', 'mc-', 'ams') and enforce CIDR format validation, reducing misconfiguration risks. However, there's no evidence of addressing a specific vulnerability.

Diff

diff --git a/managedservices/latest/ctref/schemas.md b/managedservices/latest/ctref/schemas.md
index 630cad73f..c409672dc 100644
--- a//managedservices/latest/ctref/schemas.md
+++ b//managedservices/latest/ctref/schemas.md
@@ -7 +7 @@
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@@ -17057,0 +17058,199 @@ Change type schemas specify the execution input parameters for a change type.
+## Schema for Change Type ct-1bw3q0obl5y75
+
+###### Classifications:
+
+  * [Deployment | Advanced stack components | PrefixList | Create](./deployment-advanced-prefixlist-create.html)
+
+
+
+    
+    
+    {
+      "$schema": "http://json-schema.org/draft-04/schema#",
+      "name": "Create Prefix List",
+      "description": "Create a new AWS managed prefix list. A prefix list is a set of one or more CIDR blocks that you can use to configure VPC security groups and route tables.",
+      "type": "object",
+      "properties": {
+        "DocumentName": {
+          "description": "Must be AWSManagedServices-CreatePrefixList.",
+          "type": "string",
+          "enum": [
+            "AWSManagedServices-CreatePrefixList"
+          ],
+          "default": "AWSManagedServices-CreatePrefixList"
+        },
+        "Region": {
+          "description": "The AWS Region where you want to create the prefix list, such as us-east-1.",
+          "type": "string",
+          "pattern": "^([a-z]{2}((-gov))?-[a-z]+-\\d{1})$"
+        },
+        "Parameters": {
+          "type": "object",
+          "properties": {
+            "PrefixListName": {
+              "description": "The name of the managed prefix list. The name cannot start with any case combination of \"com.amazonaws\", \"aws:\", \"mc-\" or \"ams\".",
+              "type": "array",
+              "items": {
+                "type": "string",
+                "pattern": "^(?!([aA][mM][sS]|[mM][cC]-|[aA][wW][sS]:|[cC][oO][mM]\\.[aA][mM][aA][zZ][oO][nN][aA][wW][sS]))([a-zA-Z0-9_+\\-.]+(\\s[a-zA-Z0-9_+\\-.]+)*)$",
+                "minLength": 1,
+                "maxLength": 255
+              },
+              "minItems": 1,
+              "maxItems": 1
+            },
+            "MaxEntries": {
+              "description": "Maximum number of entries for this prefix list.",
+              "type": "array",
+              "items": {
+                "type": "integer",
+                "minimum": 1,
+                "maximum": 1000
+              },
+              "minItems": 1,
+              "maxItems": 1
+            },
+            "AddressFamily": {
+              "description": "A prefix list supports a single type of IP addressing only (IPv4 or IPv6). Address family cannot be changed after the prefix list is created.",
+              "type": "array",
+              "items": {
+                "type": "string",
+                "enum": [
+                  "IPv4",
+                  "IPv6"
+                ]
+              },
+              "minItems": 1,
+              "maxItems": 1
+            },
+            "CIDRBlockIPv4": {
+              "description": "List of IPv4 address ranges in CIDR notation, in the form [{\"Cidr\":\"255.255.255.255/32\",\"Description\":\"Value\"}]. The description is optional and can be left blank. Only include IPv6 or IPv4. AWS managed prefix lists don't support both IPv4 and IPv6 together.",
+              "type": "array",
+              "items": {
+                "type": "object",
+                "properties": {
+                  "Cidr": {
+                    "type": "string",
+                    "pattern": "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\\/(3[0-2]|[1-2][0-9]|[0-9]))$"
+                  },
+                  "Description": {
+                    "type": "string",
+                    "pattern": "^[a-zA-Z0-9_.:/=+@\\s-]{0,255}$"
+                  }
+                },
+                "required": [
+                  "Cidr"
+                ],
+                "additionalProperties": false,
+                "metadata": {
+                  "ui:order": [
+                    "Cidr",
+                    "Description"
+                  ]
+                }
+              },
+              "maxItems": 1000,
+              "default": [
+                
+              ]
+            },
+            "CIDRBlockIPv6": {
+              "description": "List of IPv6 address ranges in CIDR notation, in the form [{\"Cidr\":\"ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128\",\"Description\":\"Value\"}]. The description is optional and can be left blank. Only include IPv6 or IPv4. AWS managed prefix lists don't support both IPv4 and IPv6 together.",
+              "type": "array",
+              "items": {
+                "type": "object",
+                "properties": {
+                  "Cidr": {
+                    "type": "string",
+                    "pattern": "^((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:)))(\\/([0-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8]))$"
+                  },
+                  "Description": {
+                    "type": "string",
+                    "pattern": "^[a-zA-Z0-9_.:/=+@\\s-]{0,255}$"
+                  }
+                },
+                "required": [
+                  "Cidr"
+                ],
+                "additionalProperties": false,
+                "metadata": {
+                  "ui:order": [
+                    "Cidr",
+                    "Description"
+                  ]
+                }
+              },
+              "maxItems": 1000,
+              "default": [
+                
+              ]
+            },
+            "Tags": {
+              "description": "List of tags [{\"Key\":\"KeyName\",\"Value\":\"ValueName\"}] that you want to apply to your Prefix List. KeyName cannot start with any case combination of \"aws:\", \"mc-\" or \"ams\".",
+              "type": "array",
+              "items": {
+                "type": "object",
+                "properties": {
+                  "Key": {
+                    "type": "string",
+                    "pattern": "^(?!([aA][wW][sS]:|[mM][cC]-|[aA][mM][sS]))[a-zA-Z0-9 _.:/=+\\-@]{1,128}$",
+                    "minLength": 1,
+                    "maxLength": 128
+                  },
+                  "Value": {
+                    "type": "string",
+                    "pattern": "^[\\p{L}\\p{Z}\\p{N}_.:/=+\\-@]{0,256}$",
+                    "minLength": 0,
+                    "maxLength": 256
+                  }
+                },
+                "required": [
+                  "Key"
+                ],
+                "additionalProperties": false,
+                "metadata": {
+                  "ui:order": [
+                    "Key",
+                    "Value"
+                  ]
+                }
+              },
+              "maxItems": 25,
+              "default": [
+                
+              ]
+            }
+          },
+          "metadata": {
+            "ui:order": [
+              "PrefixListName",
+              "MaxEntries",
+              "AddressFamily",
+              "CIDRBlockIPv4",
+              "CIDRBlockIPv6",
+              "Tags"
+            ]
+          },
+          "additionalProperties": false,
+          "required": [
+            "PrefixListName",
+            "MaxEntries",
+            "AddressFamily"
+          ]
+        }
+      },
+      "metadata": {
+        "ui:order": [
+          "DocumentName",
+          "Region",
+          "Parameters"
+        ]
+      },
+      "additionalProperties": false,