CVE-2024-38358: Wasmer

Low severity, CVSS 2.9. EPSS: 0.2% chance of exploitation in the next 30 days.

Wasmer is a web assembly (wasm) Runtime supporting WASIX, WASI and Emscripten. If the preopened directory has a symlink pointing outside, WASI programs can traverse the symlink and access host filesystem if the caller sets both `oflags::creat` and `rights::fd_write`. Programs can also crash the runtime by creating a symlink pointing outside with `path_symlink` and `path_open`ing the link. This issue has been addressed in commit `b9483d022` which has been included in release version 4.3.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• Wasmer Wasmer: before 4.3.2 (fixed in 4.3.2)
• Wasmerio Wasmer: before 4.3.2 (fixed in 4.3.2)

Published 2024-06-19. Last modified 2026-06-17.