---
id: CVE-2026-115379
title: >-
  Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via
  try_call
summary: >-
  Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a missing GC
  rooting vulnerability that leaves references live across try_call unrooted
  when compiling Wasm modules. Attackers can supply Wasm modules whose callee
  triggers …
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-416
vendor: bytecodealliance
product: wasmtime
affected:
  - wasmtime >= 47.0.0 < 48.0.4
  - wasmtime >= 49.0.0 < 49.0.2
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:13:47.737Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115379'
references:
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hw8m-q44c-ggrf
    label: GitHub Security Advisory (GHSA-hw8m-q44c-ggrf)
  - url: >-
      https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.4-and-49.0.0-before-49.0.2-gc-heap-corruption-via-try-call
    label: >-
      VulnCheck Advisory: Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2
      GC Heap Corruption via try_call
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.403Z'
---

## Overview

Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a missing GC rooting vulnerability that leaves references live across try_call unrooted when compiling Wasm modules. Attackers can supply Wasm modules whose callee triggers garbage collection, leaving stale or dangling references that cause GC heap corruption or incorrect execution.

## Affected

- `wasmtime >= 47.0.0 < 48.0.4`
- `wasmtime >= 49.0.0 < 49.0.2`

## Remediation

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