---
id: CVE-2026-115390
title: >-
  Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass
  DoS
summary: >-
  Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel
  accounting flaw in Cranelift-compiled call_ref and try_table catch paths.
  Malicious guests can reset consumed fuel after calls to run exponentially long
  on linear fue…
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-400
vendor: bytecodealliance
product: wasmtime
affected:
  - wasmtime >= 47.0.0 < 48.0.3
  - wasmtime >= 49.0.0 < 49.0.1
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:13:55.910Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115390'
references:
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m63x-6p34-q65x
    label: GitHub Security Advisory (GHSA-m63x-6p34-q65x)
  - url: >-
      https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.3-and-49.0.0-before-49.0.1-fuel-accounting-bypass-dos
    label: >-
      VulnCheck Advisory: Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1
      Fuel Accounting Bypass DoS
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.405Z'
---

## Overview

Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.

## Affected

- `wasmtime >= 47.0.0 < 48.0.3`
- `wasmtime >= 49.0.0 < 49.0.1`

## Remediation

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