CVE-2022-31179: Insufficient escaping of line feeds for CMD in shescape

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-08-01 · updated 2026-06-17
Weakness: CWE-74

Description

Shescape is a simple shell escape package for JavaScript. Versions prior to 1.5.8 were found to be subject to code injection on windows. This impacts users that use Shescape (any API function) to escape arguments for cmd.exe on Windows An attacker can omit all arguments following their input by including a line feed character (`'\n'`) in the payload. This bug has been patched in [v1.5.8] which you can upgrade to now. No further changes are required. Alternatively, line feed characters (`'\n'`) can be stripped out manually or the user input can be made the last argument (this only limits the impact).

Affected products

ericcornelissen shescape: before 1.5.8 — fixed in 1.5.8

How to fix

Upgrade to a fixed version: ericcornelissen shescape 1.5.8. Check the vendor advisory for mitigations.

References

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