Issues

• Fn::Split with an empty delimiter causes E1017 'empty separator' exception

  aws-cloudformation/cfn-lint#4994 · Filter by author ShryukGrandhi opened on Nov 5, 2026

• AWS::SSM::ServiceSetting throwing E3006 (does not exist in eu-west-2 region)

  aws-cloudformation/cfn-lint#4993 · Filter by author RedJem01 opened on Nov 5, 2026
  1

• Most lint time on templates with many Fn::If goes to re-checking the same condition combinations

  aws-cloudformation/cfn-lint#4991 · Filter by author hoganbr-amzn opened on Nov 4, 2026

• E3724: Incorrectly flagging Globals.Function.CodeSigningConfigArn as unexpected

  aws-cloudformation/cfn-lint#4985 · Filter by author dothomson opened on Nov 3, 2026
  1

• --format pretty crashes with a traceback when --template matches no files

  aws-cloudformation/cfn-lint#4967 · Filter by author kddejong opened on Oct 30, 2026
  1

• E3692 requires StorageType on a Multi-AZ DB cluster, but RDS defaults it to io1

  aws-cloudformation/cfn-lint#4962 · Filter by author hoganbr-amzn opened on Oct 30, 2026

• W1040: resolved Fn::ToJsonString value errors are reported under E1031, so W1040 never appears

  aws-cloudformation/cfn-lint#4961 · Filter by author hoganbr-amzn opened on Oct 30, 2026

• W1019: unused Fn::Sub variables are no longer reported since 1.26.0

  aws-cloudformation/cfn-lint#4959 · Filter by author hoganbr-amzn opened on Oct 30, 2026

• I3510: Lex V2 bot-alias/ and bot/ ARNs reported for lex:RecognizeText and lex:DescribeBot although the message lists them

  aws-cloudformation/cfn-lint#4958 · Filter by author hoganbr-amzn opened on Oct 30, 2026

• E3692: Multi-AZ DB cluster read replica reported (ReplicationSourceIdentifier not allowed, AllocatedStorage required)

  aws-cloudformation/cfn-lint#4957 · Filter by author hoganbr-amzn opened on Oct 30, 2026

• Delete E3511 once the IAM role ARN formats land in enhanced-schemas

  aws-cloudformation/cfn-lint#4934 · Filter by author kddejong opened on Oct 26, 2026

• E2002 misses every parameter type with an unrecognized base type — a misspelled String is only a W2002 warning

  aws-cloudformation/cfn-lint#4933 · Filter by author kddejong opened on Oct 26, 2026
  1

• AWS::EC2::Volume has no Iops bound at all

  aws-cloudformation/cfn-lint#4898 · Filter by author kddejong opened on Oct 24, 2026
  1

• EBS Iops-to-size ratio is not modelled

  aws-cloudformation/cfn-lint#4897 · Filter by author kddejong opened on Oct 24, 2026

• E3724 rejects AutoPublishAliasAllProperties in SAM Globals.Function since 1.54.0

  aws-cloudformation/cfn-lint#4890 · Filter by author k-matsumoto-micoworks opened on Oct 24, 2026
  2

• E3675: MasterInstanceGroup, MasterInstanceFleet and InstanceGroupConfig instance types are not validated

  aws-cloudformation/cfn-lint#4887 · Filter by author hoganbr-amzn opened on Oct 24, 2026

• E3635: Neptune db.x2iezn.* (us-east-1, us-west-2) and db.x2iedn.* (ap-southeast-1) are not in the enum

  aws-cloudformation/cfn-lint#4886 · Filter by author hoganbr-amzn opened on Oct 24, 2026

• E3641: GameLift EC2InstanceType enum lacks c8i, m9g and other types the service offers

  aws-cloudformation/cfn-lint#4885 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1

• E3640/E3642/E3643/E3644: SageMaker instance-type enums omit types the API accepts but the Price List files under another usagetype

  aws-cloudformation/cfn-lint#4884 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1

• E3010: SAM templates that expand past 500 resources pass since 1.54.0

  aws-cloudformation/cfn-lint#4883 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1

• E3601: StartAt check reports a missing target when States is an Fn::If

  aws-cloudformation/cfn-lint#4882 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1

• E8007: Condition function errors are reported as E8004, E8005, E8006 or E8001, never as E8007

  aws-cloudformation/cfn-lint#4880 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1

• E3683: ProtocolVersion on a TCP AWS::ElasticLoadBalancingV2::TargetGroup is not reported

  aws-cloudformation/cfn-lint#4879 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1

• E7010/I7010: more than 200 Mappings not reported; only the keys inside one mapping are counted

  aws-cloudformation/cfn-lint#4878 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1

• E2010/I2010: a template with 201 parameters passes, because the Parameters schema has no maxProperties

  aws-cloudformation/cfn-lint#4876 · Filter by author hoganbr-amzn opened on Oct 24, 2026
  1