CVE-2026-34942 - Wasmtime panics when transcoding misaligned utf-16 strings

CVE-2026-34942 - Wasmtime panics when transcoding misaligned utf-16 strings

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/09/2026 - 21:42
CVE ID :CVE-2026-34942
Published : April 9, 2026, 6:32 p.m. | 36 minutes ago
Description :Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings into the Component Model's utf16 or latin1+utf16 encodings improperly verified the alignment of reallocated strings. This meant that unaligned pointers could be passed to the host for transcoding which would trigger a host panic. This panic is possible to trigger from malicious guests which transfer very specific strings across components with specific addresses. Host panics are considered a DoS vector in Wasmtime as the panic conditions are controlled by the guest in this situation. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.
Severity: 0.0 | NA
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