---
id: CVE-2026-34944
aliases:
  - RUSTSEC-2026-0087
  - GHSA-qqfj-4vcm-26hv
title: >-
  Wasmtime segfault or unused out-of-sandbox load with `f64x2.splat` operator on
  Cranelift x86-64
summary: >-
  Wasmtime segfault or unused out-of-sandbox load with `f64x2.splat` operator on
  Cranelift x86-64
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: '2026-10-12T18:00:14.305574647Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0087'
references:
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0087.html'
  - url: 'https://github.com/bytecodealliance/wasmtime/pull/13011'
tags:
  - osv
  - rust
epss: 0.00255
epssPercentile: 0.15723
ingestedAt: '2026-10-13T11:45:30.186Z'
---

## Overview

This is an entry in the RustSec database for the Wasmtime security advisory
located at
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hv
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`