What is CVE-2019-15758?

CVE-2019-15758 is a medium-severity vulnerability in Webassembly Binaryen, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2019-08-29.

How severe is CVE-2019-15758?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Webassembly Binaryen

CVE-2019-15758

An issue was discovered in Binaryen 1.38.32. Missing validation rules in asmjs/asmangle.cpp can lead to an Assertion Failure at wasm/wasm.cpp in wasm::asmangle. A crafted input can cause denial-of-service, as demonstrated by wasm2js.

Published 2019-08-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (68.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Webassembly Binaryen

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

github.com/WebAssembly/binaryen/issues/2288 (Exploit, Patch, Third Party Advisory)
github.com/WebAssembly/binaryen/pull/2290 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-15758?: CVE-2019-15758 is a medium-severity vulnerability in Webassembly Binaryen, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2019-08-29.
How severe is CVE-2019-15758?: Medium severity. CVSS v3 base score is 6.5 out of 10.