Log in Start free

Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M

CVE-2026-73414Shescape: Shell injection via unescaped parentheses on Windows with CMD

Critical 9.2

In plain English

A critical-severity OS command injection 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 0.9% (higher than 60% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.2Critical
Exploit odds (30 days)0.9%top 40.5% 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. Prior to 2.1.14 and 3.0.1, getEscapeFunction in src/internal/win/cmd.js does not escape `(` and `)` when applications use the escape or escapeAll APIs on Windows with shell set to cmd.exe, or with shell set to true when CMD is the default. An attacker-controlled argument can break out of a parenthesized CMD construct and inject shell syntax depending on the original command, resulting in arbitrary command execution. This issue is fixed in versions 2.1.14 and 3.0.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmshescape2.1.14GHSA-w4hw-qcx7-56pr
npmshescape3.0.1GHSA-w4hw-qcx7-56pr

Affected products (as reported)

VendorProductVersions
ericcornelissen shescape < 2.1.14>= 3.0.0, < 3.0.1

Weakness: CWE-78, CWE-150 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References