Sandbox Breakout in realms-shim
Priority LOW 38Published · Updated
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
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.
Why it matters now
Fix Fixed realms-shim (npm): 1.2.0ses (npm): 0.6.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | realms-shim (npm) | before 1.2.0 | 1.2.0 | Patch available | GHSA-6jg8-7333-554w |
| — | ses (npm) | before 0.6.3 | 0.6.3 | Patch available | GHSA-6jg8-7333-554w |
- realms-shim (npm) Vendor— Affected before 1.2.0 Fixed in 1.2.0 Patch available GHSA-6jg8-7333-554w
- ses (npm) Vendor— Affected before 0.6.3 Fixed in 0.6.3 Patch available GHSA-6jg8-7333-554w
Remediation
- Fix · GHSA-6jg8-7333-554w realms-shim (npm) Fixed in 1.2.0 Advisory →
- Fix · GHSA-6jg8-7333-554w ses (npm) Fixed in 0.6.3 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-6jg8-7333-554w
References
Other 7
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences