Sandbox Breakout in realms-shim
Versions of realms-shim prior to 1.2.0 are vulnerable to a Sandbox Breakout. Reflect.construct can be used on the sandboxed Function constructor to reach the prototypes of the primal Realm, which may allow an attacker to escape the sandbox and execute arbitrary code.
Recommendation
Upgrade to version 1.2.0 or later.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | realms-shim | < 1.2.0 | 1.2.0 |
| npm package | ses | < 0.6.3 | 0.6.3 |
References
- https://github.com/Agoric/realms-shim/security/advisories/GHSA-6jg8-7333-554w
- https://github.com/Agoric/realms-shim
- https://github.com/advisories/GHSA-6jg8-7333-554w
- https://snyk.io/vuln/SNYK-JS-REALMSSHIM-471680
- https://www.npmjs.com/advisories/1180
- https://www.npmjs.com/advisories/1181
- https://www.npmjs.com/advisories/1182
- https://www.npmjs.com/advisories/1190
- https://www.npmjs.com/advisories/1191
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
-- Platform
- npm
- Package
realms-shim, ses- Disclosed
- 04.10.2019
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6jg8-7333-554w - CC BY 4.0
Vulnerability history: realms-shim
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 10.2019 01.2022
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- Critical 4
Disclosures per year
- 2019: 2
- 2020: 0
- 2021: 0
- 2022: 2
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
-
Sandbox Breakout in realms-shim this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.