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.
References7
- github.com/ericcornelissen/shescape/commit/43d70b59d09bbe5c3fd0…
- github.com/ericcornelissen/shescape/commit/b4b34c394e7f9da2775b…
- github.com/ericcornelissen/shescape/pull/2649
- github.com/ericcornelissen/shescape/pull/2651
- github.com/ericcornelissen/shescape/releases/tag/v2.1.14
- github.com/ericcornelissen/shescape/releases/tag/v3.0.1
- github.com/ericcornelissen/shescape/security/advisories/GHSA-w4…
Metrics
- CVSS 4.0
-
9.2
CRITICAL
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 60 · as of 12 November 2026
- CWE
- CWE-78CWE-150
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.