How severe is CVE-2023-31670?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Webassembly Binary Toolkit

CVE-2023-31670

An issue in wasm2c 1.0.32, wasm2wat 1.0.32, wasm-decompile 1.0.32, and wasm-validate 1.0.32 allows attackers to cause a Denial of Service (DoS) via running a crafted binary.

Published 2023-05-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Webassembly Binary Toolkit — versions 1.0.32

References

github.com/WebAssembly/wabt/issues/2199 (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-31670?: CVE-2023-31670 is a high-severity vulnerability in Webassembly Binary Toolkit. CVSS score: 7.5/10. Published 2023-05-23.
How severe is CVE-2023-31670?: High severity. CVSS v3 base score is 7.5 out of 10.