{"id":"CVE-2026-13311","aliases":["GHSA-395f-4hp3-45gv"],"url":"https://o3.security/vulnerability/CVE-2026-13311","summary":"shell-quote parse() is quadratic in token count, enabling denial of service","details":"shell-quote prior to 1.8.5 finalizes parsed tokens in parse() using Array.prototype.concat as a reduce accumulator, which reallocates and copies the entire growing array on every iteration. As a result parse() runs in O(n^2) time relative to the number of input tokens. An attacker who can supply an attacker-controlled string to any code path that calls parse() (no shell metacharacters are required; plain space-separated words suffice) can block the single-threaded Node.js event loop for an extended period with a small input, resulting in a denial of service. There is no code execution or data disclosure; impact is to availability only. Fixed in 1.8.5.","published":"2026-06-25T04:48:36.351Z","modified":"2026-08-21T03:46:34.112522774Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"shell-quote","fixedVersion":"1.9.0"}],"fix":null,"references":[{"type":"WEB","url":"https://www.npmjs.com/package"},{"type":"WEB","url":"https://www.npmjs.com/package/shell-quote"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13311.json"},{"type":"ADVISORY","url":"https://github.com/ljharb/shell-quote/security/advisories/GHSA-395f-4hp3-45gv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13311"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-21T03:46:34.112522774Z"}}