---
id: RUSTSEC-2026-0321
aliases:
  - GHSA-j366-h8gg-77pm
title: WASI preview 0 implementation of `poll_oneoff` circumvents fuel consumption
summary: WASI preview 0 implementation of `poll_oneoff` circumvents fuel consumption
severity: medium
cvss: 4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
vendor: wasmtime-wasi
product: wasmtime-wasi
ecosystem: rust
affected:
  - 'wasmtime-wasi >= 49.0.0, < 49.0.2'
patched:
  - wasmtime-wasi 49.0.2
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T20:30:02.577346250Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/RUSTSEC-2026-0321'
references:
  - url: 'https://crates.io/crates/wasmtime-wasi'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0321.html'
  - url: 'https://github.com/bytecodealliance/wasmtime/pull/14481'
tags:
  - osv
  - rust
ingestedAt: '2026-10-03T07:26:10.039Z'
---

## Overview

This is an entry in the RustSec database for the Wasmtime security advisory
located at
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-j366-h8gg-77pm
For more information see the GitHub-hosted security advisory.

## Affected packages

- `wasmtime-wasi >= 49.0.0, < 49.0.2`

## Remediation

Upgrade to a patched release:

- `wasmtime-wasi 49.0.2`