Wasmtime GitHub notifications bot (Oct 19 2026 at 18:30): Wasmtime GitHub notifications bot (Oct 19 2026 at 18:30):alexcrichton removed the review request for wasmtime-core-reviewers from PR #14827.
Wasmtime GitHub notifications bot (Oct 19 2026 at 18:30):alexcrichton requested wasmtime-core-reviewers for a review on PR #14827.
Wasmtime GitHub notifications bot (Oct 19 2026 at 18:30):alexcrichton opened PR #14827 from alexcrichton:pr to bytecodealliance:main:
This commit fixes an issue where a
StreamAnycan be used to re-type a future or stream in a manner that can cause a panic within Wasmtime in certain host situations. The fix here is to unconditionally perform a type-check when lowering a future or stream into a guest. This is already required for{Stream,Future}Any, and it's additionally required in this issue when theTinStreamReader<T>contains aStreamAny, for example. This technically makes the static type-check ofStreamReader<u32>redundant, but it seems best to fully close this hole since #14733 was not a complete fix for this class of issues.<!--
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Wasmtime GitHub notifications bot (Oct 19 2026 at 18:30):alexcrichton requested dicej for a review on PR #14827.
Wasmtime GitHub notifications bot (Oct 19 2026 at 18:40)::thumbs_up: pchickey submitted PR review.
Wasmtime GitHub notifications bot (Oct 19 2026 at 18:44):alexcrichton added PR #14827 Centralize type-checks of futures/streams to the merge queue.
Wasmtime GitHub notifications bot (Oct 19 2026 at 19:08)::check: alexcrichton merged PR #14827.
Wasmtime GitHub notifications bot (Oct 19 2026 at 19:08):alexcrichton removed PR #14827 Centralize type-checks of futures/streams from the merge queue.
Last updated: Oct 31 2026 at 23:03 UTC