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Mend.io Vulnerability Database
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CVE-2025-66627
Good to know:
Date: December 9, 2025
Wasmi is a WebAssembly interpreter focused on constrained and embedded systems. In versions 0.41.0, 0.41.1, 0.42.0 through 0.47.1, 0.50.0 through 0.51.2 and 1.0.0, Wasmi's linear memory implementation leads to a Use After Free vulnerability, triggered by a WebAssembly module under certain memory growth conditions. This issue potentially leads to memory corruption, information disclosure, or code execution. This issue is fixed in versions 0.41.2, 0.47.1, 0.51.3 and 1.0.1. To workaround this issue, consider limiting the maximum linear memory sizes where feasible.
Severity Score
Related Resources (5)
Severity Score
Weakness Type (CWE)
Use After Free
CWE-416Top Fix
Upgrade Version
Upgrade to version wasmi - 0.41.2;wasmi - 0.47.1;wasmi - 0.51.3;wasmi - 1.0.1;https://github.com/wasmi-labs/wasmi.git - 0.41.2;https://github.com/wasmi-labs/wasmi.git - v0.47.1;https://github.com/wasmi-labs/wasmi.git - v0.51.3;https://github.com/wasmi-labs/wasmi.git - v1.0.1
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | LOCAL |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | LOW |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | HIGH |
| Integrity (I): | HIGH |
| Availability (A): | HIGH |