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CVE-2026-118688 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

wasmtime-wasi in Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 re-appends a trailing slash to rename source paths, causing renameat on macOS and FreeBSD hosts to follow directory symlinks. A guest with sandbox write access can rename a relative symlink such as "up/" to move host directories into its sandbox and read or write them.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

CNA: [email protected]CVSS-B:7.9 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9f7-9w4p-gv38	[email protected]	AdvisoryRemedyVendor
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	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-61	UNIX Symbolic Link (Symlink) Following	[email protected]

Affected Products

Product	Versions
bytecodealliance wasmtime-wasi	<= 36.0.17 (semver) >= 37.0.0 (semver) <= 48.0.5 (semver) >= 49.0.0 (semver) <= 49.0.2 (semver)
CPE cpe:2.3:a:bytecodealliance:wasmtime::::::rust::* Remediation Upgrade: 36.0.18moderate effort Upgrade: 48.0.6moderate effort Upgrade: 49.0.3moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Modified	CISA-ADP
Oct 28, 2026	New CVE Received	[email protected]