Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Shell-Quote Project | Shell-Quote | < 1.9.0 |
Related Weaknesses (CWE)
References
- https://github.com/ljharb/shell-quote/security/advisories/GHSA-395f-4hp3-45gvVendor Advisory
- https://www.npmjs.com/package/shell-quoteProduct
- https://github.com/ljharb/shell-quote/security/advisories/GHSA-395f-4hp3-45gvVendor Advisory
FAQ
What is CVE-2026-13311?
CVE-2026-13311 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 resul...
How severe is CVE-2026-13311?
CVE-2026-13311 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-13311?
Check the references section above for vendor advisories and patch information. Affected products include: Shell-Quote Project Shell-Quote.