---
id: CVE-2026-34987
aliases:
  - RUSTSEC-2026-0095
  - GHSA-xx5w-cvp6-jv83
title: >-
  Wasmtime with Winch compiler backend may allow a sandbox-escaping memory
  access
summary: >-
  Wasmtime with Winch compiler backend may allow a sandbox-escaping memory
  access
severity: none
vendor: wasmtime
product: wasmtime
ecosystem: rust
affected:
  - 'wasmtime >= 43.0.0, < 43.0.1'
patched:
  - wasmtime 43.0.1
published: '2026-04-09'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T18:00:08.330233116Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0095'
references:
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0095.html'
  - url: 'https://github.com/bytecodealliance/wasmtime/pull/13014'
tags:
  - osv
  - rust
epss: 0.0049
epssPercentile: 0.40344
ingestedAt: '2026-10-13T11:45:30.188Z'
---

## Overview

This is an entry in the RustSec database for the Wasmtime security advisory
located at
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xx5w-cvp6-jv83
For more information see the GitHub-hosted security advisory.

## Affected packages

- `wasmtime >= 43.0.0, < 43.0.1`

## Remediation

Upgrade to a patched release:

- `wasmtime 43.0.1`