CVE-2019-7701: Webassembly Binaryen

Medium severity, CVSS 6.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A heap-based buffer over-read was discovered in wasm::SExpressionParser::skipWhitespace() in wasm-s-parser.cpp in Binaryen 1.38.22. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm2js.

Affected products

• Webassembly Binaryen: before 64 (fixed in 64)

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