CVE-2019-15759: Webassembly Binaryen

Medium severity, CVSS 6.5. EPSS: 1.3% chance of exploitation in the next 30 days.

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.

Affected products

• Webassembly Binaryen: before 89 (fixed in 89)

Published 2019-08-29. Last modified 2026-06-17.