Issues

• Bug: CloudWatchAlarmMetric.metric_stat raises KeyError for metric math expression entries

  aws-powertools/powertools-lambda-python#8673 · Filter by author thebadalov opened on Oct 26, 2026
  1

• Bug: data masking prepare_data leaves dataclasses and Pydantic models unconverted

  aws-powertools/powertools-lambda-python#8672 · Filter by author LemonCondor opened on Oct 26, 2026

• Bug: Cookie Expires labels a non-UTC aware datetime as GMT without converting it

  aws-powertools/powertools-lambda-python#8671 · Filter by author LemonCondor opened on Oct 26, 2026

• Bug: POWERTOOLS_METRICS_DISABLED is ignored by single_metric, the cold start metric, add_metric auto-flush and Datadog's lambda_metric

  bugmetrics
  aws-powertools/powertools-lambda-python#8667 · Filter by author soujasK opened on Oct 25, 2026 · 3.40.0
  2

  

• Bug: EventBridgeV2Envelope raises UnicodeDecodeError for application/octet-stream payloads that are not UTF-8 JSON

  bugparser
  aws-powertools/powertools-lambda-python#8666 · Filter by author alphasafal opened on Oct 25, 2026 · 3.38.0
  2

  

• Bug: Kafka ProtobufDeserializer reads Confluent message indexes as plain varints, dropping fields or failing for non-first message types

  bugevent_sources
  aws-powertools/powertools-lambda-python#8665 · Filter by author alphasafal opened on Oct 25, 2026 · 3.40.0
  4

  

• Bug: SqsFifoPartialProcessor fails the whole batch when a short-circuited record doesn't match the model

  batchbuggood first issue
  aws-powertools/powertools-lambda-python#8661 · Filter by author soujasK opened on Oct 25, 2026 · 3.40.0
  2

  

• Bug: batch processor crashes with AttributeError when a model validator raises a non-ValueError

  batchbuggood first issue
  aws-powertools/powertools-lambda-python#8660 · Filter by author soujasK opened on Oct 25, 2026 · 3.40.0
  2

  

• Bug: idempotent functions sharing a persistence layer silently use the first function's IdempotencyConfig

  bugidempotency
  aws-powertools/powertools-lambda-python#8659 · Filter by author soujasK opened on Oct 25, 2026 · 3.40.0
  4

  

• Bug: CachePersistenceLayer raises IdempotencyValidationError on retries with the same payload when payload_validation_jmespath is set

  buggood first issueidempotency
  aws-powertools/powertools-lambda-python#8655 · Filter by author thebadalov opened on Oct 22, 2026 · 3.40.0
  5

  

• Bug: DataMasking.erase with masking_rules ignores JSON string input

  aws-powertools/powertools-lambda-python#8636 · Filter by author LemonCondor opened on Oct 19, 2026

• Bug: DynamoDBProvider and AppConfigProvider surface bare KeyError text as the error message

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8601 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: non-UTF-8 SecretBinary with transform='binary' or 'auto' raises UnicodeDecodeError instead of TransformParameterError

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8600 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: set_parameter and set_secret do not invalidate the cached value

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8599 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: docs say recursive defaults to True for get_multiple, but SSMProvider uses False

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8598 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: get_parameters_by_name lets botocore ClientError escape instead of GetParameterError

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8597 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: SecretsProvider.get_multiple appends to the caller's Filters list on every call

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8596 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

• Bug: GetSecretError does not inherit from GetParameterError as the docstrings say

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8595 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  3

  

• Bug: get_parameters_by_name with raise_on_error=False still raises on transform errors in the decrypt path, and caches None

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8594 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: get_parameters_by_name and get() use different cache keys, so they never share cache entries

  buggood first issueparameterstriage
  aws-powertools/powertools-lambda-python#8593 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: Bedrock Agent kwargs and null content type, AppSync decorator returns None and context leak, Router duplicates, Function URL base path, Depends() with a class

  bugevent_handlersgood first issuetriage
  aws-powertools/powertools-lambda-python#8584 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: OpenAPI schema inaccuracies (responses content, Pydantic Query models, ValidationError.msg, x- extensions, Path alias, Decimal NaN)

  bugevent_handlersgood first issuetriage
  aws-powertools/powertools-lambda-python#8583 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  2

  

• Bug: AppSync Events swallows UnauthorizedException in non-aggregate handlers, class-based async middleware leaks a coroutine, HttpResolverLocal is not usable as a Lambda handler

  bugevent_handlersgood first issuetriage
  aws-powertools/powertools-lambda-python#8582 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  4

  

• Bug: header validation is inconsistent across resolvers (single-value list, repeated headers, Content-Type casing)

  bugevent_handlersgood first issuetriage
  aws-powertools/powertools-lambda-python#8581 · Filter by author leandrodamascena opened on Oct 18, 2026 · 3.39.0
  1

• Maintenance: Support for Python 3.15

  internaltriage
  aws-powertools/powertools-lambda-python#8543 · Filter by author leandrodamascena opened on Oct 12, 2026