CVE-2025-62711: Bytecodealliance Wasmtime

Low severity, CVSS 3.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Bytecodealliance Wasmtime: from 38.0.0, before 38.0.3 (fixed in 38.0.3)

Published 2025-10-24. Last modified 2026-10-08.