Inefficient Regular Expression Complexity in shescape
Impact
This impacts users that use shescape to escape arguments:
- for the Unix shell Bash, or any not-officially-supported Unix shell;
- using the
escapeorescapeAllfunctions with theinterpolationoption set totrue.
An attacker can cause polynomial backtracking in terms of the input string length due to a Regular Expression in shescape that is vulnerable to Regular Expression Denial of Service (ReDoS). Example:
import * as shescape from "shescape";
/* 1. Prerequisites */
const options = {
interpolation: true,
// and
shell: "/bin/bash",
// or
shell: "some-not-officially-supported-shell",
// or
shell: undefined, // Only if the system's default shell is bash or an unsupported shell.
};
/* 2. Attack */
let userInput = '{,'.repeat(150_000); // polynomial backtracking
/* 3. Usage */
shescape.escape(userInput, options);
// or
shescape.escapeAll([userInput], options);Patches
This bug has been patched in v1.6.1 which you can upgrade to now. No further changes required.
Workarounds
Alternatively, a maximum length can be enforced on input strings to shescape to reduce the impact of the vulnerability. It is not recommended to try and detect vulnerable input strings, as the logic for this may end up being vulnerable to ReDoS itself.
References
For more information
- Comment on commit 552e8ea
- Open an issue at https://github.com/ericcornelissen/shescape/issues (New issue > Question > Get started)
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | shescape | >= 1.5.10, < 1.6.1 | 1.6.1 |
Referencias
- https://github.com/ericcornelissen/shescape/security/advisories/GHSA-cr84-xvw4-qx3c
- https://nvd.nist.gov/vuln/detail/CVE-2022-25918
- https://github.com/ericcornelissen/shescape/commit/552e8eab56861720b1d4e5474fb65741643358f9
- https://github.com/ericcornelissen/shescape
- https://github.com/ericcornelissen/shescape/blob/main/src/unix.js%23L52
- https://github.com/ericcornelissen/shescape/releases/tag/v1.6.1
- https://security.snyk.io/vuln/SNYK-JS-SHESCAPE-3061108
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Debilidad (CWE)
CWE-1333- Plataforma
- npm
- Paquete
shescape- Publicada
- 25.10.2022
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-cr84-xvw4-qx3c - CC BY 4.0
Historial de vulnerabilidades: shescape
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 13
- Primera → última
- 03.2021 07.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 2
- Alta 5
- Media 4
- Baja 2
Divulgaciones por año
- 2021: 1
- 2022: 4
- 2023: 2
- 2024: 0
- 2025: 1
- 2026: 5
-
Inefficient Regular Expression Complexity in shescape esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.