Strawberry GraphQL @ 0.327.0

Released August 31, 2026 at 10:28 PM GMT+00:00

This release fixes a potential unbounded memory growth in the ParserCache and ValidationCache extensions.

Both extensions previously defaulted to maxsize=None , which creates an unbounded functools.lru_cache . On a network-exposed endpoint with one of these extensions enabled, a client sending many distinct query texts could grow the server’s memory without limit.

The default is now a bounded LRU cache of 128 entries, matching the functools.lru_cache default. Existing behavior can be restored by explicitly opting in to an unbounded cache:

import strawberry
from strawberry.extensions import ParserCache, ValidationCache
 
schema = strawberry.Schema(
    Query,
    extensions=[
        ParserCache(maxsize=None),  # explicitly unbounded
        ValidationCache(maxsize=100),
    ],
)

Only use maxsize=None when the set of distinct query texts reaching the server is trusted and bounded.

This release was contributed by @patrick91 in https://github.com/strawberry-graphql/strawberry/pull/4606