Heap-use-after-free in .tmpoLlNv4 in wasmtime

wasmtime Updated 02 Oct 2025

Summary

19/07/2022

Disclosed on

HIGH

Severity

Yes i

Fix available

High

Severity

Not published

CVSS Score

OSV-2022-590: Heap-use-after-free in .tmpoLlNv4. Affects wasmtime versions >= 80976b6fc7558ddd0ef71894c5e4a89346e260e6, < 2154c63de94e0372bca5a596c3eaf90147c922d1. Fixed in 2154c63de94e0372bca5a596c3eaf90147c922d1. How to fix ↓

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Background

wasmtime is an open-source runtime for WebAssembly and WASI (WebAssembly System Interface) that allows executing WebAssembly modules outside of a web browser. It provides a safe and efficient environment for running WebAssembly code. However, a vulnerability has been discovered in the .tmpoLlNv4 function of wasmtime, which can lead to a heap-use-after-free issue.

Vulnerability Detail

The vulnerability in .tmpoLlNv4 function of wasmtime is a heap-use-after-free issue. This occurs when a program attempts to access memory that has already been freed. An attacker can exploit this vulnerability by crafting a malicious WebAssembly module that triggers the use of freed memory, potentially leading to arbitrary code execution or a crash. The vulnerability has been assigned a severity rating of HIGH.

How To Fix

Minimum fixed version

2154c63de94e0372bca5a596c3eaf90147c922d1

This is the first release that contains the fix.

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Workaround

Currently, there is no known workaround for this vulnerability. It is recommended to apply the fix mentioned above by updating to the latest version of wasmtime.

Conclusion

In conclusion, a heap-use-after-free vulnerability has been discovered in the .tmpoLlNv4 function of wasmtime. This vulnerability can be exploited by an attacker to execute arbitrary code or cause a crash. It is crucial to update to the latest version of wasmtime that includes the fix to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.

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