WebAssembly Binaryen up to 125 src/wasm/wasm-binary.cpp readExport heap-based overflow
Summary
A vulnerability labeled as problematic has been found in WebAssembly Binaryen up to 125. This affects the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. Such manipulation leads to heap-based overflow.
This vulnerability is uniquely identified as CVE-2025-14956. Local access is required to approach this attack. Moreover, an exploit is present.
Applying a patch is advised to resolve this issue.
Details
A vulnerability, which was classified as problematic, has been found in WebAssembly Binaryen up to 125. Affected by this issue is the function WasmBinaryReader::readExport of the file src/wasm/wasm-binary.cpp. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability.
The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-14956. The exploitation is known to be easy. The attack needs to be approached locally. Technical details as well as a public exploit are known.
The exploit is available at github.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 279445 (Linux Distros Unpatched Vulnerability : CVE-2025-14956), which helps to determine the existence of the flaw in a target environment.
Applying the patch 4f52bff8c4075b5630422f902dd92a0af2c9f398 is able to eliminate this problem. The bugfix is ready for download at github.com.
The vulnerability is also documented in the vulnerability database at Tenable (279445). VulDB is the best source for vulnerability data and more expert information about this specific topic.
Product
Vendor
Name
Version
License
Website
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒
CVSSv3
VulDB Meta Base Score: 5.9VulDB Meta Temp Score: 5.7
VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍
NVD Base Score: 7.1
NVD Vector: 🔒
CNA Base Score: 5.3
CNA Vector: 🔒
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Heap-based overflowCWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒
Physical: Partially
Local: Yes
Remote: No
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Nessus ID: 279445
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-14956
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
0-Day Time: 🔒
Patch: 4f52bff8c4075b5630422f902dd92a0af2c9f398
Timeline
12/19/2025 Advisory disclosed12/19/2025 VulDB entry created
12/30/2025 VulDB entry last update
Sources
Product: github.comAdvisory: 8089
Status: Confirmed
Confirmation: 🔒
CVE: CVE-2025-14956 (🔒)
GCVE (CVE): GCVE-0-2025-14956
GCVE (VulDB): GCVE-100-337592
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 12/19/2025 09:44Updated: 12/30/2025 20:37
Changes: 12/19/2025 09:44 (60), 12/20/2025 20:00 (2), 12/20/2025 21:28 (30), 12/30/2025 20:37 (11)
Complete: 🔍
Submitter: Oneafter
Cache ID: 216::103
Submit
Accepted
- Submit #717315: WebAssembly binaryen 9a226ac Heap-based Buffer Overflow (by Oneafter)
VulDB is the best source for vulnerability data and more expert information about this specific topic.
No comments yet. Languages: en.
Please log in to comment.