Description

Shescape is a simple shell escape library for JavaScript. Versions 1.7.2 through 2.1.1 are vulnerable to potential environment variable exposure on Windows with CMD. This impact users of Shescape on Windows that explicitly configure `shell: 'cmd.exe'` or `shell: true` using any of `quote`/`quoteAll`/`escape`/`escapeAll`. An attacker may be able to get read-only access to environment variables. This bug has been patched in v2.1.2. For those who are already using v2 of Shescape, no further changes are required. Those who are are using v1 of Shescape should follow the migration guide to upgrade to v2. There is no plan to release a patch compatible with v1 of Shescape. As a workaround, users can remove all instances of `%` from user input before using Shescape.

Classification

CVE ID: CVE-2025-30222

CVSS Base Severity: LOW

CVSS Base Score: 2.1

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

Affected Products

Vendor: ericcornelissen

Product: shescape

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 3.54% (scored less or equal to compared to others)

EPSS Date: 2025-04-18 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-30222
https://github.com/ericcornelissen/shescape/security/advisories/GHSA-66pp-5p9w-q87j
https://github.com/ericcornelissen/shescape/pull/1916
https://github.com/ericcornelissen/shescape/commit/0a81f1eb077bab8caae283a2490cd7be9af179c6
https://github.com/ericcornelissen/shescape/releases/tag/v2.1.2

Timeline