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
Exact source revision recorded 28 Oct 2026 19:46:48 UTC. It does not establish the source's current position. Latest evidence.
cve-program · CVE-2026-118688
Publishedwasmtime-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.
- Source published
- 28 Oct 2026 18:59:56 UTC
- Source modified
- 28 Oct 2026 18:59:56 UTC
- Observed here
- 28 Oct 2026 19:46:48 UTC
- Source terms
- CVE Program Terms of Use
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.
CVSS 4.0 · 8.8 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
CVSS 3.1 · 7.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L