CVE-2026-73413
High
Description
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.
SeverityHigh
CVSS8.7
Exploit probability48. percentile0.6%
ProductShescape
PublishedAug 12, 2026
First seenAug 12, 2026
How to fix
Update
- shescape2.1.14, 3.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| shescapenpm | 2.1.11 ≤ v < 2.1.14, 3.0.0 ≤ v < 3.0.1 | 2.1.14, 3.0.1 |
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