Vulnerability in Bytecodealliance Wasmtime

CVE-2026-34946

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler contains a vulnerability where the compilation of the table.fill instruction can result in a host panic. This means that a v…

EPSS: 0.000 (4.9th percentile) — read the EPSS interpretation.

Affected products

Bytecodealliance Wasmtime — versions >= 25.0.0, < 36.0.7, >= 37.0.0, < 42.0.2, >= 43.0.0, < 44.0.1

Weakness classification (CWE)

CWE-670 — Always-Incorrect Control Flow Implementation

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q49f-xg75-m9xw (x_refsource_CONFIRM)