CVE-2026-13311 – shell-quote parse() is quadratic in token count, enabling denial of service

CVE ID :CVE-2026-13311

Published : June 25, 2026, 4:48 a.m. | 56 minutes ago

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.

Severity: 8.7 | HIGH

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