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EUVD-2023-1143Published

wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is…

Exact source revision recorded 8 Nov 2026 01:06:37 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

euvd · EUVD-2023-1143

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

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datePublished: Mar 8, 2023, 12:00:00 AM

dateUpdated: Feb 25, 2025, 2:59:59 PM

1 related source bulletins · separate from aliases

msrc_CVE-2023-27477: wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend Cranelift has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1 5.0.1 and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.

CVE-2023-27477

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