---
id: CVE-2022-39393
aliases:
  - RUSTSEC-2022-0075
  - GHSA-wh6w-3828-g9qf
  - RUSTSEC-2022-0098
title: Bug in pooling instance allocator
summary: Bug in pooling instance allocator
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'
vendor: wasmtime
product: wasmtime
ecosystem: rust
affected:
  - 'wasmtime >= 2.0.0, < 2.0.2'
patched:
  - wasmtime 2.0.2
published: '2022-11-10'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T18:00:05.117534654Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2022-0075'
references:
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2022-0075.html'
  - url: >-
      https://github.com/bytecodealliance/wasmtime/commit/2614f2e9d2d36805ead8a8da0fa0c6e0d9e428a0
  - url: >-
      https://github.com/bytecodealliance/wasmtime/commit/2614f2e9d2d36805ead8a8da0fa0c6e0d9e428a0
  - url: >-
      https://github.com/bytecodealliance/wasmtime/commit/3535acbf3be032ef1ba0b469b8ab92538a8a18a6
  - url: 'https://rustsec.org/advisories/RUSTSEC-2022-0098.html'
tags:
  - osv
  - rust
cvssSource: osv
epss: 0.00754
epssPercentile: 0.55215
ingestedAt: '2026-10-13T11:45:30.157Z'
---

## Overview

bug in Wasmtime's implementation of its pooling instance allocator where when a linear memory is reused for another instance the initial heap snapshot of the prior instance can be visible, erroneously to the next instance.

Mitigations are described [here](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-wh6w-3828-g9qf).

## Affected packages

- `wasmtime >= 2.0.0, < 2.0.2`

## Remediation

Upgrade to a patched release:

- `wasmtime 2.0.2`