---
id: RUSTSEC-2026-0268
aliases:
  - GHSA-x84v-gj2h-g759
title: Guest controlled-size host heap allocation through WASIp3 streams
summary: Guest controlled-size host heap allocation through WASIp3 streams
severity: none
vendor: wasmtime
product: wasmtime
ecosystem: rust
affected:
  - 'wasmtime >= 47.0.0, < 47.0.4'
patched:
  - wasmtime 47.0.4
published: '2026-08-20'
updated: '2026-08-31'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0268'
references:
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0268.html'
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-x84v-gj2h-g759
tags:
  - osv
  - rust
ingestedAt: '2026-08-31T19:30:40.179Z'
---

## Overview

This is an entry in the RustSec database for the Wasmtime security advisory
located at
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-x84v-gj2h-g759
For more information see the GitHub-hosted security advisory.

## Affected packages

- `wasmtime >= 47.0.0, < 47.0.4`

## Remediation

Upgrade to a patched release:

- `wasmtime 47.0.4`