---
id: CVE-2026-115387
title: >-
  Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host
  Panic via WASI Filesystem Timestamp Overflow
summary: >-
  Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1
  contains a denial of service vulnerability in wasmtime-wasi that allows guest
  WASI programs to panic the host via overflowing filesystem timestamps.
  Attackers can pa…
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-190
vendor: bytecodealliance
product: wasmtime
affected:
  - wasmtime < 36.0.16
  - wasmtime >= 37.0.0 < 48.0.3
  - wasmtime >= 49.0.0 < 49.0.1
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:13:53.696Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115387'
references:
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-j2g9-4prp-pf6h
    label: GitHub Security Advisory (GHSA-j2g9-4prp-pf6h)
  - url: >-
      https://www.vulncheck.com/advisories/wasmtime-before-36.0.16-37.0.0-before-48.0.3-and-49.0.0-before-49.0.1-host-panic-via-wasi-filesystem-timestamp-overflow
    label: >-
      VulnCheck Advisory: Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and
      49.0.0 before 49.0.1 Host Panic via WASI Filesystem Timestamp Overflow
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.405Z'
---

## Overview

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 contains a denial of service vulnerability in wasmtime-wasi that allows guest WASI programs to panic the host via overflowing filesystem timestamps. Attackers can pass atim or mtim values whose sub-second field overflows the seconds field to path_filestat_set_times, fd_filestat_set_times, set-times, or set-times-at, crashing the host.

## Affected

- `wasmtime < 36.0.16`
- `wasmtime >= 37.0.0 < 48.0.3`
- `wasmtime >= 49.0.0 < 49.0.1`

## Remediation

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