---
id: RUSTSEC-2026-0378
aliases:
  - GHSA-9pvw-hwfg-92h5
title: >-
  Panic lowering a host-created component model stream into a guest that expects
  a different payload type
summary: >-
  Panic lowering a host-created component model stream into a guest that expects
  a different payload type
severity: none
vendor: wasmtime
product: wasmtime
ecosystem: rust
affected:
  - 'wasmtime >= 49.0.0, < 49.0.4'
patched:
  - wasmtime 49.0.4
published: '2026-10-19'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T11:15:37.066435437Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0378'
references:
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0378.html'
  - url: 'https://github.com/bytecodealliance/wasmtime/pull/14827'
tags:
  - osv
  - rust
ingestedAt: '2026-10-21T11:54:42.769Z'
---

## Overview

This is an entry in the RustSec database for the Wasmtime security advisory
located at
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5
For more information see the GitHub-hosted security advisory.

## Affected packages

- `wasmtime >= 49.0.0, < 49.0.4`

## Remediation

Upgrade to a patched release:

- `wasmtime 49.0.4`