Vulnerability in Bytecodealliance Wasmtime

CVE-2025-64345

Wasmtime is a runtime for WebAssembly. Prior to version 38.0.4, 37.0.3, 36.0.3, and 24.0.5, Wasmtime's Rust embedder API contains an unsound interaction where a WebAssembly shared linear memory could be viewed as a type which provides safe…

Vulnerability class: Race Condition

EPSS: 0.001 (0.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 1.8 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-64345?
CVE-2025-64345 is a low-severity vulnerability in Bytecodealliance Wasmtime, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 1.8/10. Published 2025-11-12.
How severe is CVE-2025-64345?
Low severity. CVSS v3 base score is 1.8 out of 10.