{"id":"GHSA-pqg4-j6r4-53mv","summary":"shell-quote: `quote()` command injection via a line terminator in a token after a `{ comment }` token","details":"### Impact\n\n`quote()` emits a `{ comment }` token as `#` followed by its text, which comments out the rest of the shell line, including the opening quote of any later string token. A line terminator in that later string ends the comment, and the rest of the string is parsed as shell input:\n\n```js\nquote(['echo', 'ok', { comment: 'x' }, 'a\\nid;#']);\n// echo ok #x 'a\n// id;#'\n```\n\nPassed to `sh`, `bash`, `dash`, `ksh`, or `zsh`, this runs `id`.\n\n`parse()` emits a comment token for a `#` in the middle of a word (for example `http://example.com/#frag`), so callers that combine `parse()` output with another untrusted string, such as `quote(parse(untrustedCommand).concat(untrustedArg))`, are affected. The fix for CVE-2026-9277 rejected line terminators in the comment's own text, but not in the tokens after it.\n\nExploitation requires an attacker-controlled string containing a line terminator that follows a `{ comment }` token in the same `quote()` call.\n\n### Patches\n\nFixed in v1.11.0: `quote()` throws a `TypeError` when a string after a `{ comment }` token contains a line terminator (`\\n`, `\\r`, U+2028, or U+2029).\n\n### Workarounds\n\nDrop every token after a `{ comment }` token before calling `quote()`, or reject line terminators in untrusted strings. Separately, do not append other shell text after `quote()` output that contains a comment, since the comment swallows it.","aliases":["CVE-2026-102422"],"modified":"2026-10-06T13:45:05.629884170Z","published":"2026-10-06T13:40:36Z","database_specific":{"nvd_published_at":"2026-09-29T04:17:55Z","cwe_ids":["CWE-78"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2026-10-06T13:40:36Z"},"references":[{"type":"WEB","url":"https://github.com/ljharb/shell-quote/security/advisories/GHSA-pqg4-j6r4-53mv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102422"},{"type":"WEB","url":"https://github.com/ljharb/shell-quote/commit/6002b2ed90c6b83095eb272b6b0adaf3a172b0bc"},{"type":"PACKAGE","url":"https://github.com/ljharb/shell-quote"}],"affected":[{"package":{"name":"shell-quote","ecosystem":"npm","purl":"pkg:npm/shell-quote"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.8.4"},{"fixed":"1.11.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-pqg4-j6r4-53mv/GHSA-pqg4-j6r4-53mv.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}