CVE-2025-66627
HIGH EPSS 2.6%
Published Dec 9, 20256mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
Published Dec 9, 2025 6mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-416 Use After Free Memory Safety
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| wasmi-labs | wasmi | * | ≥0.41.0 – <0.41.2 |
| wasmi-labs | wasmi | * | ≥0.47.0 – <0.47.1 |
| wasmi-labs | wasmi | * | ≥0.51.0 – <0.51.3 |
| wasmi-labs | wasmi | 1.0.0 | any |
References 1
- github.com https://github.com/wasmi-labs/wasmi/security/advisories/GHSA-g4v2-cjqp-rfmq
Remediation
- github.com https://github.com/wasmi-labs/wasmi/security/advisories/GHSA-g4v2-cjqp-rfmq