What’s Vulnerable › Vulnerabilities

CVE-2025-14956: WebAssembly Binaryen wasm-binary.cpp readExport heap-based overflow

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-19 · updated 2026-06-17
• Weakness: CWE-119

Description

A vulnerability was determined in WebAssembly Binaryen up to 125. Affected by this issue is the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. Patch name: 4f52bff8c4075b5630422f902dd92a0af2c9f398. It is recommended to apply a patch to fix this issue.

Affected products

• WebAssembly Binaryen: through 125

References

• https://github.com/WebAssembly/binaryen/
• https://github.com/WebAssembly/binaryen/commit/4f52bff8c4075b5630422f902dd92a0af2c9f398
• https://github.com/WebAssembly/binaryen/issues/8089
• https://github.com/WebAssembly/binaryen/pull/8092
• https://github.com/oneafter/1204/blob/main/hbf
• https://vuldb.com/?ctiid.337592
• https://vuldb.com/?id.337592
• https://vuldb.com/?submit.717315

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