Inefficient Algorithmic Complexity Affecting shell-quote package, versions <1.9.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SHELLQUOTE-17457810
- published25 Jun 2026
- disclosed25 Jun 2026
- creditKyo
Introduced: 25 Jun 2026
CVE-2026-13311 (opens in a new tab)How to fix?
Upgrade shell-quote to version 1.9.0 or higher.
Overview
shell-quote is a package used to quote and parse shell commands.
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the parseInternal function of parse.js, where parse() finalizes the token list with Array.prototype.concat inside a reduce, copying the entire growing array on every iteration for O(n²) behavior. An attacker can block the single-threaded Node.js event loop and sustain a denial of service by passing a large space-separated string to any code path that calls parse(), with roughly 128 KB stalling the loop for about 15 seconds and 256 KB for about 57 seconds.