Buffer overflow in Webassembly Binaryen
CVE-2025-14956
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (10.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Webassembly Binaryen — versions 125
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/WebAssembly/binaryen/issues/8089 (issue-tracking, Exploit, Third Party Advisory, Issue Tracking)
- github.com/WebAssembly/binaryen/pull/8092 (issue-tracking, Issue Tracking)
- github.com/oneafter/1204/blob/main/hbf (exploit, Not Applicable)
- github.com/WebAssembly/binaryen/commit/4f52bff8c4075b5630422f902dd92a0af2c9f398 (Patch, patch)
- github.com/WebAssembly/binaryen/ (product)
Frequently asked questions
- What is CVE-2025-14956?
- CVE-2025-14956 is a medium-severity vulnerability in Webassembly Binaryen, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2025-12-19.
- How severe is CVE-2025-14956?
- Medium severity. CVSS v3 base score is 5.3 out of 10.