ericcornelissen Shescape up to 2.1.13/3.0.0 src/internal/compose.js compose resource consumption

Summaryinfo

A vulnerability described as problematic has been identified in ericcornelissen Shescape up to 2.1.13/3.0.0. Impacted is the function compose of the file src/internal/compose.js. Such manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-73413. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in ericcornelissen Shescape up to 2.1.13/3.0.0. It has been rated as problematic. Affected by this issue is the function compose of the file src/internal/compose.js. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-73413 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 2.1.14 or 3.0.1 eliminates this vulnerability.

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Productinfo

Vendor

• ericcornelissen

Name

• Shescape

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 3.0

Website

• Product: https://github.com/ericcornelissen/shescape/

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