{"id":"CVE-2021-21384","aliases":["EUVD-2021-0648","GHSA-f2rp-38vg-j3gh"],"status":"published","title":"Null characters not escaped in shescape","description":"shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.","severity":{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00573,"percentile":0.47789,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-88"],"published":"2021-03-18T23:47:56Z","modified":"2026-10-20T10:54:29Z","fixes":[{"ecosystem":"npm","package":"shescape","fixed_in":["1.1.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"shescape","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.3"}]}]},{"source":"osv","ecosystem":"npm","package":"shescape","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.1.3"}]}]}],"products":[{"vendor":"ericcornelissen","product":"shescape"},{"vendor":"shescape_project","product":"shescape"}],"references":[{"url":"https://github.com/ericcornelissen/shescape/security/advisories/GHSA-f2rp-38vg-j3gh","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://github.com/ericcornelissen/shescape/commit/07a069a66423809cbedd61d980c11ca44a29ea2b","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory","web"]},{"url":"https://www.npmjs.com/package/shescape","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21384","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-f2rp-38vg-j3gh"}],"sources":{"cve":[{"id":"CVE-2021-21384","title":"Null characters not escaped in shescape","description":"shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.","status":"published","published":"2021-03-18T23:50:13Z","modified":"2024-08-03T18:09:15.79Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2021-0648","description":"shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.","status":"published","published":"2021-03-18T23:50:13Z","modified":"2024-08-03T18:09:15Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:06.913643Z"}],"ghsa":[{"id":"GHSA-f2rp-38vg-j3gh","title":"Null characters not escaped","description":"### Impact\n\nAnyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a [null character](https://en.wikipedia.org/wiki/Null_character) into the payload. For example (on Windows):\n\n```javascript\nconst cp = require(\"child_process\");\nconst shescape = require(\"shescape\");\n\nconst nullChar = String.fromCharCode(0);\nconst payload = \"foo\\\" \u0026\u0026 ls -al ${nullChar} \u0026\u0026 echo \\\"bar\";\nconsole.log(cp.execSync(`echo ${shescape.quote(payload)}`));\n// foototal 3\n// drwxr-xr-x 1 owner XXXXXX      0 Mar 13 18:44 .\n// drwxr-xr-x 1 owner XXXXXX      0 Mar 13 00:09 ..\n// drwxr-xr-x 1 owner XXXXXX      0 Mar 13 18:42 folder                                                                 \n// -rw-r--r-- 1 owner XXXXXX      0 Mar 13 18:42 file\n```\n\n### Patches\n\nThe problem has been patched in [v1.1.3](https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3) which you can upgrade to now. No further changes are required.\n\n### Workarounds\n\nAlternatively, null characters can be stripped out manually using e.g. `arg.replace(/\\u{0}/gu, \"\")`","status":"published","published":"2021-03-18T23:47:56Z","modified":"2023-02-01T05:05:14Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N","level":"medium"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:36:33.613868Z"}],"nvd":[{"id":"CVE-2021-21384","description":"shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.","status":"published","published":"2021-03-19T00:15:11.793Z","modified":"2026-06-17T03:35:27.62Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:06:50.805771Z"}],"osv":[{"id":"CVE-2021-21384","description":"shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.","status":"published","published":"2021-03-19T00:15:11.793Z","modified":"2026-10-20T10:54:29.30791514Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"GHSA-f2rp-38vg-j3gh","title":"Null characters not escaped","description":"### Impact\n\nAnyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a [null character](https://en.wikipedia.org/wiki/Null_character) into the payload. For example (on Windows):\n\n```javascript\nconst cp = require(\"child_process\");\nconst shescape = require(\"shescape\");\n\nconst nullChar = String.fromCharCode(0);\nconst payload = \"foo\\\" \u0026\u0026 ls -al ${nullChar} \u0026\u0026 echo \\\"bar\";\nconsole.log(cp.execSync(`echo ${shescape.quote(payload)}`));\n// foototal 3\n// drwxr-xr-x 1 owner XXXXXX      0 Mar 13 18:44 .\n// drwxr-xr-x 1 owner XXXXXX      0 Mar 13 00:09 ..\n// drwxr-xr-x 1 owner XXXXXX      0 Mar 13 18:42 folder                                                                 \n// -rw-r--r-- 1 owner XXXXXX      0 Mar 13 18:42 file\n```\n\n### Patches\n\nThe problem has been patched in [v1.1.3](https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3) which you can upgrade to now. No further changes are required.\n\n### Workarounds\n\nAlternatively, null characters can be stripped out manually using e.g. `arg.replace(/\\u{0}/gu, \"\")`","status":"published","published":"2021-03-18T23:47:56Z","modified":"2026-09-10T03:49:01.950835153Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N","level":"medium"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T15:46:45.639885Z"}]}}