---
id: CVE-2026-115393
title: >-
  Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and
  47.0.0 before 47.0.3 Cross-Engine Type Confusion
summary: >-
  Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and
  47.0.0 before 47.0.3 contains a type confusion vulnerability because several
  Store APIs fail to validate that objects belong to the Store's Engine.
  Embedders mixin…
severity: low
cvss: 3.8
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-787
vendor: bytecodealliance
product: wasmtime
affected:
  - wasmtime < 24.0.12
  - wasmtime >= 25.0.0 < 36.0.13
  - wasmtime >= 37.0.0 < 46.0.2
  - wasmtime >= 47.0.0 < 47.0.3
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:13:59.314Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115393'
references:
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hgjw-h833-99q9
    label: GitHub Security Advisory (GHSA-hgjw-h833-99q9)
  - url: >-
      https://www.vulncheck.com/advisories/wasmtime-before-24.0.12-25.0.0-before-36.0.13-37.0.0-before-46.0.2-and-47.0.0-before-47.0.3-cross-engine-type-confusion
    label: >-
      VulnCheck Advisory: Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0
      before 46.0.2, and 47.0.0 before 47.0.3 Cross-Engine Type Confusion
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.408Z'
---

## Overview

Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.

## Affected

- `wasmtime < 24.0.12`
- `wasmtime >= 25.0.0 < 36.0.13`
- `wasmtime >= 37.0.0 < 46.0.2`
- `wasmtime >= 47.0.0 < 47.0.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.