{"id":"CVE-2023-51661","aliases":["EUVD-2023-3103","GHSA-4mq4-7rw3-vm5j"],"status":"published","title":"Filesystem sandbox not enforced in wasmer-cli","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.","severity":{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00595,"percentile":0.48896,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-284"],"published":"2023-12-13T13:32:38Z","modified":"2026-10-28T02:30:21Z","fixes":[{"ecosystem":"crates.io","package":"wasmer-cli","fixed_in":["4.2.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"crates.io","package":"wasmer-cli","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"4.2.4"}]}]},{"source":"osv","ecosystem":"crates.io","package":"wasmer-cli","ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"4.2.4"}]}]}],"products":[{"vendor":"wasmer","product":"wasmer"},{"vendor":"wasmerio","product":"wasmer"}],"references":[{"url":"https://github.com/wasmerio/wasmer/security/advisories/GHSA-4mq4-7rw3-vm5j","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/wasmerio/wasmer/issues/4267","tags":["x_refsource_MISC","x_transferred","Issue Tracking","report","web"]},{"url":"https://github.com/wasmerio/wasmer/commit/4d63febf9d8b257b0531963b85df48d45d0dbf3c","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-51661","tags":["advisory"]},{"url":"https://github.com/wasmerio/wasmer/commit/e3923612c23123025c26f982d390e34df7df030f","tags":["web"]},{"url":"https://github.com/advisories/GHSA-4mq4-7rw3-vm5j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/51xxx/CVE-2023-51661.json","tags":["advisory"]},{"url":"https://github.com/wasmerio/wasmer","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-51661","title":"Filesystem sandbox not enforced in wasmer-cli","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.","status":"published","published":"2023-12-22T14:54:23.103Z","modified":"2025-04-17T20:29:41.019Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:35:17.48054Z"}],"euvd":[{"id":"EUVD-2023-3103","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.","status":"published","published":"2023-12-22T14:54:23Z","modified":"2025-04-17T20:29:41Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T20:52:20.597725Z"}],"ghsa":[{"id":"GHSA-4mq4-7rw3-vm5j","title":"Wasmer filesystem sandbox not enforced","description":"### Summary\nAs of Wasmer version v4.2.3, Wasm programs can access the filesystem outside of the sandbox.\n\n### Details\nhttps://github.com/wasmerio/wasmer/issues/4267\n\n### PoC\nA minimal Rust program:\n\n```\nfn main() {\n    let f = std::fs::OpenOptions::new()\n        .write(true)\n        .create_new(true)\n        .open(\"abc\")\n        .unwrap();\n}\n```\n\nThis should be compiled with `cargo build --target wasm32-wasi`. The compiled program, when run with wasmer WITHOUT `--dir`, can still create a file in the working directory.\n\n### Impact\nService providers running untrusted Wasm code on Wasmer can unexpectedly expose the host filesystem.","status":"published","published":"2023-12-13T13:32:38Z","modified":"2024-01-03T16:44:37Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:37:28.753349Z"}],"nvd":[{"id":"CVE-2023-51661","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.","status":"published","published":"2023-12-22T15:15:08.377Z","modified":"2026-06-17T06:41:24.997Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:08:57.117371Z"}],"osv":[{"id":"CVE-2023-51661","title":"Filesystem sandbox not enforced in wasmer-cli","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.","status":"published","published":"2023-12-22T14:54:23.103Z","modified":"2026-10-28T02:30:21.807769974Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T15:44:35.245372Z"},{"id":"GHSA-4mq4-7rw3-vm5j","title":"Wasmer filesystem sandbox not enforced","description":"### Summary\nAs of Wasmer version v4.2.3, Wasm programs can access the filesystem outside of the sandbox.\n\n### Details\nhttps://github.com/wasmerio/wasmer/issues/4267\n\n### PoC\nA minimal Rust program:\n\n```\nfn main() {\n    let f = std::fs::OpenOptions::new()\n        .write(true)\n        .create_new(true)\n        .open(\"abc\")\n        .unwrap();\n}\n```\n\nThis should be compiled with `cargo build --target wasm32-wasi`. The compiled program, when run with wasmer WITHOUT `--dir`, can still create a file in the working directory.\n\n### Impact\nService providers running untrusted Wasm code on Wasmer can unexpectedly expose the host filesystem.","status":"published","published":"2023-12-13T13:32:38Z","modified":"2026-09-10T03:49:59.270552989Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T15:46:37.148947Z"}]}}