---
title: "CVE-2026-118688: Wasmtime Wasmtime-wasi - Path Traversal"
description: "Wasmtime Wasmtime-wasi < 36.0.18, 37.0.0 < 48.0.6, and 49.0.0 < 49.0.3 contains a directory traversal caused by re-appending trailing slash to rename source paths on macOS and FreeBSD, letting guest with sandbox write access read or write host directories via symlink rename."
url: https://panop.io/threat-heartbeat/CVE-2026-118688/
---

# CVE-2026-118688 Wasmtime Wasmtime-wasi - Path Traversal

Wasmtime Wasmtime-wasi < 36.0.18, 37.0.0 < 48.0.6, and 49.0.0 < 49.0.3 contains a directory traversal caused by re-appending trailing slash to rename source paths on macOS and FreeBSD, letting guest with sandbox write access read or write host directories via symlink rename.

CVSS base score 7.9 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-118688)

## Details

Type

Path Traversal

Impact

File System Read, File System Write

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-61](https://cwe.mitre.org/data/definitions/61.html)

## Vendor fix

Update to versions 36.0.18, 48.0.6, 49.0.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-118688](https://nvd.nist.gov/vuln/detail/CVE-2026-118688)
- [https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9f7-9w4p-gv38](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9f7-9w4p-gv38)
- [https://www.vulncheck.com/advisories/wasmtime-before-36.0.18-37.0.0-before-48.0.6-and-49.0.0-before-49.0.3-sandbox-escape-via-symlink-rename](https://www.vulncheck.com/advisories/wasmtime-before-36.0.18-37.0.0-before-48.0.6-and-49.0.0-before-49.0.3-sandbox-escape-via-symlink-rename)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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