3.38.0

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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: CachePersistenceLayer raises the deprecation warning that tells you to use CachePersistenceLayer
aws-powertools/powertools-lambda-python#8574 · opened on Oct 17, 2026 · 3.38.0
2
Bug: CachePersistenceLayer ignores a custom expiry_attr when reading records
aws-powertools/powertools-lambda-python#8575 · opened on Oct 17, 2026 · 3.38.0
2
Bug: APIGatewayHttpResolver returns 404 for every route when the stage is not $default and rawPath has no stage prefix
aws-powertools/powertools-lambda-python#8577 · opened on Oct 18, 2026 · 3.38.0
2
Bug: body validation crashes on non-ASCII multipart data and accepts a JSON array for an object parameter
aws-powertools/powertools-lambda-python#8578 · opened on Oct 18, 2026 · 3.38.0
2
Bug: exception handlers hijack the default 404 and bypass _to_response (body null on ALB, dict/tuple crash)
aws-powertools/powertools-lambda-python#8579 · opened on Oct 18, 2026 · 3.38.0
2
Bug: routing and Response issues: unescaped route regex, regex strip_prefixes, gzip q=0, bytes JSON body, is_json() casing, missing Vary: Origin
aws-powertools/powertools-lambda-python#8580 · opened on Oct 18, 2026 · 3.38.0
2
Bug: get_parameters_by_name returns {} instead of raising when GetParameters fails with raise_on_error=True
aws-powertools/powertools-lambda-python#8586 · opened on Oct 18, 2026 · 3.38.0
1
Bug: get_parameters_by_name raises KeyError for names with a version or label selector
aws-powertools/powertools-lambda-python#8587 · opened on Oct 18, 2026 · 3.38.0
3
Bug: get_app_config ignores environment and application after the first call
aws-powertools/powertools-lambda-python#8588 · opened on Oct 18, 2026 · 3.38.0
2
Bug: AppConfigProvider never recovers after get_latest_configuration rejects the poll token
aws-powertools/powertools-lambda-python#8589 · opened on Oct 18, 2026 · 3.38.0
3
Bug: get_parameters_by_name mutates the caller's parameters dict, so later global decrypt/transform are ignored
aws-powertools/powertools-lambda-python#8590 · opened on Oct 18, 2026 · 3.38.0
2
Bug: parameters cache key ignores sdk_options, decrypt and recursive, so different requests share one cached value
aws-powertools/powertools-lambda-python#8591 · opened on Oct 18, 2026 · 3.38.0
2
Bug: get_secrets_by_name returns secrets that were not requested, and a different result once cached
aws-powertools/powertools-lambda-python#8592 · opened on Oct 18, 2026 · 3.38.0
2
fix(event_handler): strip the HTTP API stage only when rawPath has it
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#8605 opened Oct 18, 2026 · Updated Oct 19, 2026
3
fix(idempotency): read expiry from expiry_attr in CachePersistenceLayer
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#8606 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(parameters): avoid mutating caller's dict in get_parameters_by_name
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#8607 opened Oct 18, 2026 · Updated Oct 19, 2026
5
fix(parameters): recover AppConfig sessions after rejected poll tokens
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#8615 opened Oct 18, 2026 · Updated Oct 20, 2026
2
fix(parameters): raise GetParameterError when GetParameters fails in fail-fast mode
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#8616 opened Oct 18, 2026 · Updated Oct 19, 2026
4
fix(parameters): include sdk_options in the cache key
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#8619 opened Oct 18, 2026 · Updated Oct 19, 2026
3
fix(parameters): support version and label selectors in get_parameters_by_name
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#8620 opened Oct 18, 2026 · Updated Oct 19, 2026
4
fix(parameters): return only requested secret names
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#8621 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(event_handler): keep catch-all exception handlers off 404s and adapt exception handler returns
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#8624 opened Oct 18, 2026 · Updated Oct 19, 2026
2
fix(idempotency): stop CachePersistenceLayer from emitting the Redis deprecation warning
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#8625 opened Oct 18, 2026 · Updated Oct 19, 2026
1
fix(event_handler): harden multipart and JSON body validation
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#8626 opened Oct 18, 2026 · Updated Oct 20, 2026
2
fix(parameters): key appconfig default provider by environment and ap…
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#8635 opened Oct 19, 2026 · Updated Oct 20, 2026
4

Issues