Upcoming Security Release for Wasmtime on 2025-10-07

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Alex Crichton

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Sep 30, 2025, 3:59:26 PMSep 30
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The Wasmtime project would like to announce a forthcoming security release of Wasmtime.

The release will be made available on 2025-10-07 at approximately 17:00 UTC. Additionally, an advisory will be made available on the same date and time at https://github.com/advisories.

The highest severity issue fixed in this release is LOW based on the classification scheme defined by CVSS.

Alex Crichton

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Oct 7, 2025, 1:26:13 PMOct 7
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[Update 2025-10-07] Security releases available

Wasmtime version 37.0.2 is now available on crates.io. Additionally, binary releases are available on Github for the Wasmtime C-API shared library and CLI at https://github.com/bytecodealliance/wasmtime/releases.

This release fixes the following security issues rated LOW:

  Memory leak in C API with `externref` and `anyref` types
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