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CVE-2025-66627

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CVE-2025-66627

Published: Dec 9, 2025

Modified: Dec 9, 2025

PUBLISHED

CVSS v3.1

8.4

HIGH

Description

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.

VendorProductVersions

wasmi-labs

wasmi

affected
>= 0.41.0, < 0.41.2
affected
>= 0.42.0, < 0.47.1
affected
>= 0.50.0, < 0.51.3
affected
>= 1.0.0, < 1.0.1

Weaknesses (CWE)

CWE-416

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

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