Improper Encoding or Escaping of Output Affecting shescape package, versions <2.1.15>=3.0.0 <3.0.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SHESCAPE-18855681
- published16 Aug 2026
- disclosed16 Aug 2026
- creditalimony
Introduced: 16 Aug 2026
NewCVE-2026-73055 (opens in a new tab)How to fix?
Upgrade shescape to version 2.1.15, 3.0.2 or higher.
Overview
shescape is a simple shell escape library
Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output via the getEscapeFunction logic in src/internal/unix/busybox.js. An attacker can reveal the user's home directory and alter how a command interprets an assignment-prefixed value by supplying input such as :~ or a=~ to escape or escapeAll when Unix shell escaping targets BusyBox sh. On affected Unix systems where shell is set to "sh" or true and /bin/sh points to BusyBox, the escaped tilde is expanded in assignment contexts instead of being treated as data, causing commands like V=...; echo $V to print : followed by the home path.