CVE-2026-13311
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 gro…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | shell-quote | <= 1.8.4 | 1.9.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Shell-Quote Project | Shell-Quote | before 1.9.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-395f-4hp3-45gv
- https://github.com/ljharb/shell-quote/security/advisories/GHSA-395f-4hp3-45gv
- https://nvd.nist.gov/vuln/detail/CVE-2026-13311
- https://github.com/ljharb/shell-quote/commit/7ff5488599d01c323514f02f5efb74088dd134ec
- https://github.com/ljharb/shell-quote/releases/tag/v1.9.0
- https://www.npmjs.com/package/shell-quote