CVE-2026-73413: Ericcornelissen Shescape

High severity, CVSS 8.7. EPSS: 0.6% chance of exploitation in the next 30 days.

Shescape is a simple shell escape library for JavaScript. From 2.1.11 until 2.1.14 and 3.0.1, the flag-protection loop in compose in src/internal/compose.js repeatedly joins and slices flag fragments when flagProtection is enabled, which is the default, making processing quadratic in input size across the escape, escapeAll, quote, and quoteAll APIs. An attacker who can supply a large untrusted input containing many flag fragments can consume CPU and cause denial of service. This issue is fixed in versions 2.1.14 and 3.0.1.

Affected products

• Ericcornelissen Shescape: from 2.1.11, before 2.1.14 (fixed in 2.1.14); from 3.0.0, before 3.0.1 (fixed in 3.0.1)

Published 2026-08-12. Last modified 2026-09-09.