CVE-2026-118688

HighCVSS 7.9/10Last modified Nov 4, 2026

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 3.1 7.9/10CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L

Weakness enumeration

CWE-61

Affected software

Vendor	Product	Versions
bytecodealliance	wasmtime	< 36.0.18; >= 37.0.0, < 48.0.6; >= 49.0.0, < 49.0.3

References

Timeline

Published: Oct 28, 2026
Last modified: Nov 4, 2026
NVD status: Deferred

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