Is CVE-2026-118688 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-118688?

CVE-2026-118688 has a CVSS v3 severity of HIGH (7.9).

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CVE-2026-118688

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.