CVE-2019-7703: Webassembly Binaryen

Medium severity, CVSS 6.5. EPSS: 1.5% chance of exploitation in the next 30 days.

In Binaryen 1.38.22, there is a use-after-free problem in wasm::WasmBinaryBuilder::visitCall in wasm-binary.cpp. Remote attackers could leverage this vulnerability to cause a denial-of-service via a wasm file, as demonstrated by wasm-merge.

Affected products

• Webassembly Binaryen: before 64 (fixed in 64)

Published 2019-02-10. Last modified 2026-06-17.