3.39.0

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•Last updated Oct 19, 2026

Community-friendly bug fixes from the Event Handler, Parameters and Idempotency audits. Pick one, comment on the issue, and we'll assign it to you.

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Bug: header validation is inconsistent across resolvers (single-value list, repeated headers, Content-Type casing)
aws-powertools/powertools-lambda-python#8581 · opened on Oct 18, 2026 · 3.39.0
1
Bug: AppSync Events swallows UnauthorizedException in non-aggregate handlers, class-based async middleware leaks a coroutine, HttpResolverLocal is not usable as a Lambda handler
aws-powertools/powertools-lambda-python#8582 · opened on Oct 18, 2026 · 3.39.0
4
Bug: OpenAPI schema inaccuracies (responses content, Pydantic Query models, ValidationError.msg, x- extensions, Path alias, Decimal NaN)
aws-powertools/powertools-lambda-python#8583 · 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
aws-powertools/powertools-lambda-python#8584 · 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
aws-powertools/powertools-lambda-python#8593 · opened on Oct 18, 2026 · 3.39.0
2
Bug: get_parameters_by_name with raise_on_error=False still raises on transform errors in the decrypt path, and caches None
aws-powertools/powertools-lambda-python#8594 · opened on Oct 18, 2026 · 3.39.0
2
Bug: GetSecretError does not inherit from GetParameterError as the docstrings say
aws-powertools/powertools-lambda-python#8595 · opened on Oct 18, 2026 · 3.39.0
3
Bug: SecretsProvider.get_multiple appends to the caller's Filters list on every call
aws-powertools/powertools-lambda-python#8596 · opened on Oct 18, 2026 · 3.39.0
1
Bug: get_parameters_by_name lets botocore ClientError escape instead of GetParameterError
aws-powertools/powertools-lambda-python#8597 · opened on Oct 18, 2026 · 3.39.0
2
Bug: docs say recursive defaults to True for get_multiple, but SSMProvider uses False
aws-powertools/powertools-lambda-python#8598 · opened on Oct 18, 2026 · 3.39.0
2
Bug: set_parameter and set_secret do not invalidate the cached value
aws-powertools/powertools-lambda-python#8599 · opened on Oct 18, 2026 · 3.39.0
2
Bug: non-UTF-8 SecretBinary with transform='binary' or 'auto' raises UnicodeDecodeError instead of TransformParameterError
aws-powertools/powertools-lambda-python#8600 · opened on Oct 18, 2026 · 3.39.0
2
Bug: DynamoDBProvider and AppConfigProvider surface bare KeyError text as the error message
aws-powertools/powertools-lambda-python#8601 · opened on Oct 18, 2026 · 3.39.0
2
fix(event_handler): unify header validation, scalar list joining, and content-type parsing
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#8602 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(parameters): do not mutate the caller's Filters list in SecretsProvider.get_multiple
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#8604 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(parameters): handle invalid UTF-8 transform errors
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#8609 opened Oct 18, 2026 · Updated Oct 19, 2026
2
docs(parameters): correct the documented default of recursive per provider
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#8610 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(parameters): make GetSecretError inherit from GetParameterError
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#8611 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(parameters): use shared cache key in get_parameters_by_name
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#8614 opened Oct 18, 2026 · Updated Oct 19, 2026
1
fix(parameters): wrap GetParameters client errors in get_parameters_by_name
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#8617 opened Oct 18, 2026 · Updated Oct 19, 2026
1
fix(parameters): clarify errors for missing DynamoDB and AppConfig data
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#8618 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(parameters): invalidate cache after set_parameter and set_secret
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#8622 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(parameters): handle transform failures gracefully in get_parameters_by_name
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#8623 opened Oct 18, 2026 · Updated Oct 20, 2026
2
fix(event_handlers): Bedrock kwargs and media type, AppSync registry and context, Router duplicates, Function URL base path, Depends with classes
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#8629 opened Oct 19, 2026 · Updated Oct 19, 2026
1
fix(event_handler): correct six OpenAPI schema inaccuracies
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#8630 opened Oct 19, 2026 · Updated Oct 19, 2026
2

Issues