---
id: CVE-2026-115390
aliases:
  - RUSTSEC-2026-0315
  - GHSA-m63x-6p34-q65x
title: >-
  `call_ref` and exception `catch` can drop some fuel accounting, leading to
  exponential fuel amplification
summary: >-
  `call_ref` and exception `catch` can drop some fuel accounting, leading to
  exponential fuel amplification
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'
vendor: wasmtime
product: wasmtime
ecosystem: rust
affected:
  - 'wasmtime >= 49.0.0, < 49.0.1'
patched:
  - wasmtime 49.0.1
published: '2026-09-24'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T06:25:41Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0315'
references:
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0315.html'
  - url: 'https://github.com/bytecodealliance/wasmtime/pull/14407'
  - 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:
  - osv
  - rust
  - cve.org
epss: 0.00242
epssPercentile: 0.15538
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-23T14:48:31.982167Z'
cwe:
  - CWE-400
ingestedAt: '2026-10-22T22:00:50.405Z'
---

## Overview

This is an entry in the RustSec database for the Wasmtime security advisory
located at
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m63x-6p34-q65x
For more information see the GitHub-hosted security advisory.

## Affected packages

- `wasmtime >= 49.0.0, < 49.0.1`

## Remediation

Upgrade to a patched release:

- `wasmtime 49.0.1`