Wasmtime is a runtime for WebAssembly. In versions from 38.0.0 to before 38.0.3, the implementation of component-model related host-to-wasm trampolines in Wasmtime contained a bug where it's possible to carefully craft a component, which when called in a specific way, would crash the host with a segfault or assert failure. Wasmtime 38.0.3 has been released and is patched to fix this issue. There are no workarounds.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/bytecodealliance/wasmtime/commit/192f2fcdadfec9d0cf6b58548a85a7307450cbf5 Patch
- https://github.com/bytecodealliance/wasmtime/pull/11592 Patch
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4h67-722j-5pmc Patch, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 2.1 · bytecodeallianceNVD modified 2026-10-08 11:10
Affected (CPE criteria) 1
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*