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CVE-2025-66627— Wasmi's Linear Memory has a Critical Use After Free Vulnerability

Quick assessment

Affected
wasmi-labs wasmi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wasmi是Wasmi Labs开源的一个用于嵌入式系统的WebAssembly解释器。 Wasmi 0.41.0版本、0.41.1版本、0.42.0版本至0.47.1版本、0.50.0版本至0.51.2版本和1.0.0版本存在资源管理错误漏洞，该漏洞源于线性内存实现存在缺陷，可能导致释放后重用。

CVSS 8.4 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2025-66627

Vulnerability Information
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Vulnerability Title
Wasmi's Linear Memory has a Critical Use After Free Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Wasmi 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wasmi是Wasmi Labs开源的一个用于嵌入式系统的WebAssembly解释器。 Wasmi 0.41.0版本、0.41.1版本、0.42.0版本至0.47.1版本、0.50.0版本至0.51.2版本和1.0.0版本存在资源管理错误漏洞，该漏洞源于线性内存实现存在缺陷，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wasmi-labs wasmi >= 0.41.0, < 0.41.2 -

II. Public POCs for CVE-2025-66627

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III. Intelligence Information for CVE-2025-66627

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IV. Related Vulnerabilities

Same product: wasmi
Same vendor: wasmi-labs
Same weakness: CWE-416