CVE-2020-18382: Webassembly Binaryen

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Heap-buffer-overflow in /src/wasm/wasm-binary.cpp in wasm::WasmBinaryBuilder::visitBlock(wasm::Block*) in Binaryen 1.38.26. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-opt.

Affected products

• Webassembly Binaryen: version 1.38.26 only

Published 2023-08-22. Last modified 2026-06-17.