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 ↗

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

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

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