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Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M

CVE-2026-73413Shescape: Quadratic-time denial of service in flag-protection

High 8.7

In plain English

A high-severity uncontrolled resource consumption in shescape from ericcornelissen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.6%top 51.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmshescape2.1.14GHSA-gm3r-q2wp-hw87
npmshescape3.0.1GHSA-gm3r-q2wp-hw87

Affected products (as reported)

VendorProductVersions
ericcornelissen shescape >= 2.1.11, < 2.1.14>= 3.0.0, < 3.0.1

Weakness: CWE-400, CWE-407 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References