What’s Vulnerable › Vulnerabilities

CVE-2019-7701

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-02-10 · updated 2026-06-17
• Weakness: CWE-125

Description

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

How to fix

Upgrade to a fixed version: WebAssembly Binaryen 64. Check the vendor advisory for mitigations.

References

• https://github.com/WebAssembly/binaryen/issues/1863
• https://github.com/WebAssembly/binaryen/issues/1863

Get alerted when CVE-2019-7701 or the next vulnerability affects your stack