shell-quote: `quote()` command injection via a line terminator in a token after a `{ comment }` token

{
  "id": "ea306187436dbfebaafd9893b202b8326e7bae94ba7e7c23c605b121d37551f6",
  "url": "https://osv.dev/vulnerability/GHSA-pqg4-j6r4-53mv",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "shell-quote: `quote()` command injection via a line terminator in a token after a `{ comment }` token",
    "summary": "### Impact `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: ```js quote(['echo', 'ok', { comment: 'x' }, 'a\\nid;#']); // echo ok #x 'a // id;#' ``` Passed to `sh`, `bash`, `dash`, `ksh`, or `zsh`, this runs `id`. `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. Exploitation requires an attacker-controlled string containing a line terminator that follows a `{ comment }` token in the same `quote()` call. ### Patches Fixed 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). ### Workarounds Drop 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.",
    "evidence": "osv:GHSA-pqg4-j6r4-53mv",
    "products": [
      {
        "name": {
          "value": "shell-quote",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.11.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "GHSA-pqg4-j6r4-53mv",
      "aliases": [
        "CVE-2026-102422",
        "GHSA-pqg4-j6r4-53mv"
      ],
      "metrics": [
        {
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.8.4"
                },
                {
                  "fixed": "1.11.0"
                }
              ]
            }
          ],
          "package": {
            "name": "shell-quote",
            "purl": "pkg:npm/shell-quote",
            "ecosystem": "npm"
          },
          "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"
          }
        }
      ],
      "modified": "2026-10-06T13:45:06.393196831Z",
      "provider": "osv",
      "references": [
        "https://github.com/ljharb/shell-quote/security/advisories/GHSA-pqg4-j6r4-53mv",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-102422",
        "https://github.com/ljharb/shell-quote/commit/6002b2ed90c6b83095eb272b6b0adaf3a172b0bc",
        "https://github.com/ljharb/shell-quote"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-78"
        ],
        "severity": "CRITICAL",
        "github_reviewed": true,
        "nvd_published_at": "2026-09-29T04:17:55Z",
        "github_reviewed_at": "2026-10-06T13:40:36Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-102422",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 89087,
  "published_at": "2026-10-06T13:40:36+00:00"
}