CVE-2023-51661: Filesystem sandbox not enforced in wasmer-cli

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-12-22 · updated 2026-06-17
Weakness: CWE-284

Description

Wasmer is a WebAssembly runtime that enables containers to run anywhere: from Desktop to the Cloud, Edge and even the browser. Wasm programs can access the filesystem outside of the sandbox. Service providers running untrusted Wasm code on Wasmer can unexpectedly expose the host filesystem. This vulnerability has been patched in version 4.2.4.

Affected products

wasmerio wasmer: from 3.0.0 before 4.2.4 — fixed in 4.2.4

How to fix

Upgrade to a fixed version: wasmerio wasmer 4.2.4. Check the vendor advisory for mitigations.

References

https://github.com/wasmerio/wasmer/commit/4d63febf9d8b257b0531963b85df48d45d0dbf3c
https://github.com/wasmerio/wasmer/issues/4267
https://github.com/wasmerio/wasmer/security/advisories/GHSA-4mq4-7rw3-vm5j
https://github.com/wasmerio/wasmer/commit/4d63febf9d8b257b0531963b85df48d45d0dbf3c
https://github.com/wasmerio/wasmer/issues/4267
https://github.com/wasmerio/wasmer/security/advisories/GHSA-4mq4-7rw3-vm5j

Get alerted when CVE-2023-51661 or the next vulnerability affects your stack