What is CVE-2023-46331?

CVE-2023-46331 is a medium-severity vulnerability in Webassembly Binary Toolkit, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2023-10-23.

How severe is CVE-2023-46331?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Out-of-bounds Read in Webassembly Binary Toolkit

CVE-2023-46331

WebAssembly wabt 1.0.33 has an Out-of-Bound Memory Read in in DataSegment::IsValidRange(), which lead to segmentation fault.

Vulnerability class: Buffer Overflow

Published 2023-10-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (9.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Webassembly Binary Toolkit — versions 1.0.33

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/WebAssembly/wabt/issues/2310 (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-46331?: CVE-2023-46331 is a medium-severity vulnerability in Webassembly Binary Toolkit, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2023-10-23.
How severe is CVE-2023-46331?: Medium severity. CVSS v3 base score is 5.5 out of 10.