CVE-2026-119136

CVSS 5.9 (medium) · published 2026-10-29

Wasmtime 42.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains insufficient checks in Store when mixing async-style and sync-style WebAssembly calls. Embedders re-entering WebAssembly via sync APIs from host functions called asynchronously can trigger runtime panics or unsound cross-thread movement of !Send host variables.

Weakness: CWE-1265

Source: NVD CVE-2026-119136

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-vcg5-q8m5-8379
• https://www.vulncheck.com/advisories/wasmtime-42.0.0-before-48.0.6-and-49.0.0-before-49.0.3-async-entrypoint-enforcement-bypass

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