---
id: CVE-2026-34983
aliases:
  - RUSTSEC-2026-0090
  - GHSA-hfr4-7c6c-48w2
  - PYSEC-2026-151
title: 'Use-after-free bug after cloning `wasmtime::Linker`'
summary: 'Use-after-free bug after cloning `wasmtime::Linker`'
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: '2026-10-12T18:00:09.243186370Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0090'
references:
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0090.html'
  - url: 'https://github.com/bytecodealliance/wasmtime/issues/12069'
tags:
  - osv
  - rust
epss: 0.00118
epssPercentile: 0.0158
ingestedAt: '2026-10-13T11:45:30.187Z'
---

## Overview

This is an entry in the RustSec database for the Wasmtime security advisory
located at
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hfr4-7c6c-48w2
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`