---
id: CVE-2026-115385
title: >-
  Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Host Panic via WASIp3
  Timestamps
summary: >-
  Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial of
  service vulnerability in the wasmtime-wasi WASIp3 implementation that allows
  guests to abort the Unix host process. Guests with mutable preopened directory
  acces…
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-754
vendor: bytecodealliance
product: wasmtime
affected:
  - wasmtime >= 46.0.0 < 48.0.4
  - wasmtime >= 49.0.0 < 49.0.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-26T19:29:09.734230Z'
published: '2026-10-22'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T19:38:29.749Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115385'
references:
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mr2v-56j5-cmfc
    label: GitHub Security Advisory (GHSA-mr2v-56j5-cmfc)
  - url: >-
      https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.4-and-49.0.0-before-49.0.2-host-panic-via-wasip3-timestamps
    label: >-
      VulnCheck Advisory: Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2
      Host Panic via WASIp3 Timestamps
  - url: 'https://crates.io/crates/wasmtime-wasi'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0324.html'
  - url: 'https://github.com/bytecodealliance/wasmtime/pull/14486'
tags:
  - cve.org
  - osv
  - rust
epss: 0.00112
epssPercentile: 0.01372
aliases:
  - RUSTSEC-2026-0324
  - GHSA-mr2v-56j5-cmfc
ecosystem: rust
patched:
  - wasmtime-wasi 49.0.2
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 the wasmtime-wasi WASIp3 implementation that allows guests to abort the Unix host process. Guests with mutable preopened directory access can call set-times or set-times-at with negative seconds timestamps before the epoch, triggering an assertion failure that crashes the host.

## 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.

## Package advisory (CVE-2026-115385)

Affected packages:

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

Patched in:

- `wasmtime-wasi 49.0.2`

Source: https://osv.dev/vulnerability/RUSTSEC-2026-0324