---
id: CVE-2026-115382
title: >-
  Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout
  Panic DoS
summary: >-
  Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a
  denial-of-service vulnerability in its wasi:http implementation that allows
  guests to panic the host. Guests can specify a zero between-bytes-timeout
  request option, which…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-1284
vendor: bytecodealliance
product: wasmtime
affected:
  - wasmtime >= 46.0.0 < 48.0.4
  - wasmtime >= 49.0.0 < 49.0.2
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:13:49.956Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115382'
references:
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-w4qr-p94g-mjhv
    label: GitHub Security Advisory (GHSA-w4qr-p94g-mjhv)
  - url: >-
      https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.4-and-49.0.0-before-49.0.2-wasi-http-zero-timeout-panic-dos
    label: >-
      VulnCheck Advisory: Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2
      wasi:http Zero Timeout Panic DoS
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.404Z'
---

## Overview

Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.

## Affected

- `wasmtime >= 46.0.0 < 48.0.4`
- `wasmtime >= 49.0.0 < 49.0.2`

## Remediation

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