What is CVE-2019-15759?

CVE-2019-15759 is a medium-severity vulnerability in Webassembly Binaryen, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2019-08-29.

How severe is CVE-2019-15759?

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

NULL pointer dereference in Webassembly Binaryen

CVE-2019-15759

An issue was discovered in Binaryen 1.38.32. Two visitors in ir/ExpressionManipulator.cpp can lead to a NULL pointer dereference in wasm::LocalSet::finalize in wasm/wasm.cpp. A crafted input can cause segmentation faults, leading to 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: 0.013 (68.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Webassembly Binaryen

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/WebAssembly/binaryen/issues/2288 (Exploit, Patch, Third Party Advisory)
github.com/WebAssembly/binaryen/pull/2289 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-15759?: CVE-2019-15759 is a medium-severity vulnerability in Webassembly Binaryen, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2019-08-29.
How severe is CVE-2019-15759?: Medium severity. CVSS v3 base score is 6.5 out of 10.