{"id":"CVE-2023-35931","aliases":["EUVD-2023-1669","GHSA-3g7p-8qhx-mc8r"],"status":"published","title":"Shescape potential environment variable exposure on Windows with CMD","description":"Shescape is a simple shell escape library for JavaScript. An attacker may be able to get read-only access to environment variables. This bug has been patched in version 1.7.1.","severity":{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00811,"percentile":0.57244,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-526"],"published":"2023-06-22T20:01:39Z","modified":"2026-10-28T02:30:58Z","fixes":[{"ecosystem":"npm","package":"shescape","fixed_in":["1.7.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"shescape","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.1"}]}]},{"source":"osv","ecosystem":"npm","package":"shescape","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.7.1"}]}]}],"products":[{"vendor":"ericcornelissen","product":"shescape"},{"vendor":"shescape_project","product":"shescape"}],"references":[{"url":"https://github.com/ericcornelissen/shescape/security/advisories/GHSA-3g7p-8qhx-mc8r","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/ericcornelissen/shescape/pull/982","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://github.com/ericcornelissen/shescape/commit/d0fce70f987ac0d8331f93cb45d47e79436173ac","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1","tags":["x_refsource_MISC","x_transferred","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-35931","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-3g7p-8qhx-mc8r"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35931.json","tags":["advisory"]},{"url":"https://github.com/ericcornelissen/shescape","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-35931","title":"Shescape potential environment variable exposure on Windows with CMD","description":"Shescape is a simple shell escape library for JavaScript. An attacker may be able to get read-only access to environment variables. This bug has been patched in version 1.7.1.\n\n\n","status":"published","published":"2023-06-23T19:32:53.897Z","modified":"2024-12-05T16:09:33.483Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-526"],"updated_at":"2026-11-02T14:35:33.794347Z"}],"euvd":[{"id":"EUVD-2023-1669","description":"Shescape is a simple shell escape library for JavaScript. An attacker may be able to get read-only access to environment variables. This bug has been patched in version 1.7.1.\n\n\n","status":"published","published":"2023-06-23T19:32:53Z","modified":"2024-12-05T16:09:33Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-03T00:04:40.064683Z"}],"ghsa":[{"id":"GHSA-3g7p-8qhx-mc8r","title":"Shescape potential environment variable exposure on Windows with CMD","description":"### Impact\n\nThis impact users of Shescape:\n\n1. On Windows using the Windows Command Prompt (i.e. `cmd.exe`), and\n2. Using `quote`/`quoteAll` or `escape`/`escapeAll` with the `interpolation` option set to `true`.\n\nAn attacker may be able to get read-only access to environment variables. Example:\n\n```javascript\nimport * as cp from \"node:child_process\";\nimport * as shescape from \"shescape\";\n\n// 1. Prerequisites\nconst options = {\n    shell: \"cmd.exe\",\n    // Or\n    shell: undefined, // Only if the default shell is CMD\n\n    // And\n    interpolation: true, // Only applies to `escape` and `escapeAll` usage\n}\n\n// 2. Attack (one of many)\nconst payload = \"%PATH%\";\n\n// 3. Usage\nlet escapedPayload;\n\nescapedPayload = shescape.quote(payload, options);\n// Or\nescapedPayload = shescape.quoteAll([payload], options);\n// Or\nescapedPayload = shescape.escape(payload, options);\n// Or\nescapedPayload = shescape.escapeAll([payload], options);\n\n// And (example)\nconst result = cp.execSync(`echo Hello ${escapedPayload}`, options);\n\n// 4. Impact\nconsole.log(result.toString());\n// Outputs \"Hello\" followed by the contents of the PATH environment variable\n```\n\n### Patches\n\nThis bug has been patched in [v1.7.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1) which you can upgrade to now. No further changes are required.\n\n### Workarounds\n\nAlternatively, users can remove all instances of `%` from user input, either before or after using Shescape.\n\n### References\n\n- Shescape Pull request [#982](https://github.com/ericcornelissen/shescape/pull/982)\n- Shescape commit [`d0fce70`](https://github.com/ericcornelissen/shescape/commit/d0fce70f987ac0d8331f93cb45d47e79436173ac)\n- Shescape Release [v1.7.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1)\n","status":"published","published":"2023-06-22T20:01:39Z","modified":"2023-11-07T05:02:07Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-526"],"updated_at":"2026-11-02T14:37:15.055009Z"}],"nvd":[{"id":"CVE-2023-35931","description":"Shescape is a simple shell escape library for JavaScript. An attacker may be able to get read-only access to environment variables. This bug has been patched in version 1.7.1.\n\n\n","status":"published","published":"2023-06-23T20:15:09.357Z","modified":"2026-06-17T06:05:29.517Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-526"],"updated_at":"2026-11-02T14:08:12.414559Z"}],"osv":[{"id":"CVE-2023-35931","title":"Shescape potential environment variable exposure on Windows with CMD","description":"Shescape is a simple shell escape library for JavaScript. An attacker may be able to get read-only access to environment variables. This bug has been patched in version 1.7.1.\n\n\n","status":"published","published":"2023-06-23T19:32:53.897Z","modified":"2026-10-28T02:30:58.304262722Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-526"],"updated_at":"2026-11-02T15:44:32.510144Z"},{"id":"GHSA-3g7p-8qhx-mc8r","title":"Shescape potential environment variable exposure on Windows with CMD","description":"### Impact\n\nThis impact users of Shescape:\n\n1. On Windows using the Windows Command Prompt (i.e. `cmd.exe`), and\n2. Using `quote`/`quoteAll` or `escape`/`escapeAll` with the `interpolation` option set to `true`.\n\nAn attacker may be able to get read-only access to environment variables. Example:\n\n```javascript\nimport * as cp from \"node:child_process\";\nimport * as shescape from \"shescape\";\n\n// 1. Prerequisites\nconst options = {\n    shell: \"cmd.exe\",\n    // Or\n    shell: undefined, // Only if the default shell is CMD\n\n    // And\n    interpolation: true, // Only applies to `escape` and `escapeAll` usage\n}\n\n// 2. Attack (one of many)\nconst payload = \"%PATH%\";\n\n// 3. Usage\nlet escapedPayload;\n\nescapedPayload = shescape.quote(payload, options);\n// Or\nescapedPayload = shescape.quoteAll([payload], options);\n// Or\nescapedPayload = shescape.escape(payload, options);\n// Or\nescapedPayload = shescape.escapeAll([payload], options);\n\n// And (example)\nconst result = cp.execSync(`echo Hello ${escapedPayload}`, options);\n\n// 4. Impact\nconsole.log(result.toString());\n// Outputs \"Hello\" followed by the contents of the PATH environment variable\n```\n\n### Patches\n\nThis bug has been patched in [v1.7.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1) which you can upgrade to now. No further changes are required.\n\n### Workarounds\n\nAlternatively, users can remove all instances of `%` from user input, either before or after using Shescape.\n\n### References\n\n- Shescape Pull request [#982](https://github.com/ericcornelissen/shescape/pull/982)\n- Shescape commit [`d0fce70`](https://github.com/ericcornelissen/shescape/commit/d0fce70f987ac0d8331f93cb45d47e79436173ac)\n- Shescape Release [v1.7.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1)\n","status":"published","published":"2023-06-22T20:01:39Z","modified":"2026-09-10T03:50:01.856488325Z","cvss":[{"version":"3.1","score":3.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-526"],"updated_at":"2026-11-02T15:46:35.747385Z"}]}}