High severity · published Dec 19, 2025
CVE-2025-14956
WebAssembly Binaryen wasm-binary.cpp readExport heap-based overflow
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
Binaryen · WebAssembly
125 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-14956
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-14956
github.com
https://github.com/WebAssembly/binaryen/
Patch
https://github.com/WebAssembly/binaryen/commit/4f52bff8c4075b5630422f902dd92a0af2c9f398
Exploit
https://github.com/WebAssembly/binaryen/issues/8089
Issue Tracking
https://github.com/WebAssembly/binaryen/pull/8092
Not Applicable
https://github.com/oneafter/1204/blob/main/hbf
Permissions Required
https://vuldb.com/?ctiid.337592
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