Wasmtime

Bytecode Alliance · BytecodeAlliance.Wasmtime.Portable

A fast and secure runtime for WebAssembly

Wasmtime is a Bytecode Alliance project that is a standalone wasm-only optimizing runtime for WebAssembly and WASI. It runs WebAssembly code outside of the Web, and can be used both as a command-line utility or as a library embedded in a larger application.

winget install --id BytecodeAlliance.Wasmtime.Portable --exact --source winget

Latest 43.0.1

Release Notes

43.0.1 Released 2026-04-09. Fixed

  • Miscompiled guest heap access enables sandbox escape on aarch64 Cranelift. GHSA-jhxm-h53p-jm7w
  • Wasmtime with Winch compiler backend may allow a sandbox-escaping memory access. GHSA-xx5w-cvp6-jv83
  • Out-of-bounds write or crash when transcoding component model strings. GHSA-394w-hwhg-8vgm
  • Host panic when Winch compiler executes table.fill. GHSA-q49f-xg75-m9xw
  • Wasmtime segfault or unused out-of-sandbox load with f64x2.splat operator on x86-64. GHSA-qqfj-4vcm-26hv
  • Improperly masked return value from table.grow with Winch compiler backend. GHSA-f984-pcp8-v2p7
  • Panic when transcoding misaligned utf-16 strings. GHSA-jxhv-7h78-9775
  • Panic when lifting flags component value. GHSA-m758-wjhj-p3jq
  • Heap OOB read in component model UTF-16 to latin1+utf16 string transcoding. GHSA-hx6p-xpx3-jvvv
  • Use-after-free bug after cloning wasmtime::Linker. GHSA-hfr4-7c6c-48w2
  • Data leakage between pooling allocator instances. GHSA-6wgr-89rj-399p
  • Host data leakage with 64-bit tables and Winch. GHSA-m9w2-8782-2946

Installer type: zip

Architecture Scope Download SHA256
x64 Download CB627546A9F0F2F24F3D68FCE34B40F13D6B1ABE4B70F3AFDE0038AD9FE4E6EA

Details

Homepage
https://wasmtime.dev/
License
Apache-2.0
Publisher
Bytecode Alliance
Support
https://github.com/bytecodealliance/wasmtime/issues
Copyright
Copyright © 2019-2023 the Bytecode Alliance contributors.

Tags

aotcraneliftjitruntimerustsandboxstandalonewasiwasmwasmtimewebassembly

Older versions (48)

43.0.0
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42.0.1
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42.0.0
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41.0.3
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41.0.2
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41.0.1
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41.0.0
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40.0.2
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40.0.1
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40.0.0
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39.0.1
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39.0.0
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38.0.4
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38.0.2
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38.0.1
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37.0.2
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37.0.1
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37.0.0
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36.0.2
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36.0.1
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36.0.0
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35.0.0
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34.0.1
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33.0.2
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33.0.0
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32.0.1
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32.0.0
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31.0.0
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29.0.1
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17.0.1
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17.0.0
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16.0.0
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15.0.1
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15.0.0
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14.0.4
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13.0.0
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12.0.2
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12.0.1
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12.0.0
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11.0.1
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11.0.0
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10.0.1
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10.0.0
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9.0.4
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9.0.3
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