What’s Vulnerable › Vulnerabilities

CVE-2020-18378

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-08-22 · updated 2026-06-17
• Weakness: CWE-476

Description

A NULL pointer dereference was discovered in SExpressionWasmBuilder::makeBlock in wasm/wasm-s-parser.c in Binaryen 1.38.26. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-as.

Affected products

• WebAssembly Binaryen: 1.38.26

References

• https://github.com/WebAssembly/binaryen/issues/1900
• https://github.com/WebAssembly/binaryen/issues/1900

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