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TI-2026-20304 Aliases CVE-2026-25142GHSA-9p4w-fq8m-2hp7

SandboxJS Prototype Pollution -> Sandbox Escape -> RCE

Priority MEDIUM 51CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.

Summary

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.27, SanboxJS does not properly restrict __lookupGetter__ which can be used to obtain prototypes, which can be used for escaping the sandbox / remote code execution. This vulnerability is fixed in 0.8.27.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01213 68th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed SandboxJS (nyariv): 0.8.27@nyariv/sandboxjs (npm): 0.8.27

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nyarivSandboxJSbefore 0.8.270.8.27Patch availableCNA
—@nyariv/sandboxjs (npm)before 0.8.270.8.27Patch availableGHSA-9p4w-fq8m-2hp7
  • SandboxJS Vendornyariv Affected before 0.8.27 Fixed in 0.8.27 Patch available CNA
  • @nyariv/sandboxjs (npm) Vendor— Affected before 0.8.27 Fixed in 0.8.27 Patch available GHSA-9p4w-fq8m-2hp7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*before 0.8.27Vulnerablenyariv
  • cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:* Versions before 0.8.27 Vulnerable ·nyariv

Remediation

  • Fix · CNA SandboxJS (nyariv) Fixed in 0.8.27
  • Fix · GHSA-9p4w-fq8m-2hp7 @nyariv/sandboxjs (npm) Fixed in 0.8.27 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25142
  2. 2026-10-03 Alias added: GHSA-9p4w-fq8m-2hp7

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2026-31962 SandboxJS: Sandbox escape via Function.caller leakage of internal call op CVSS 3.1CRITICAL 10.0
  • TI-2026-26503 SandboxJS: Sandbox integrity escape CVSS 3.1CRITICAL 10.0
  • TI-2026-21440 SandboxJS has a Sandbox Escape CVSS 3.1CRITICAL 10.0
  • TI-2026-20741 SandboxJS has a sandbox escape via TOCTOU bug on keys in property accesses CVSS 3.1CRITICAL 10.0
  • TI-2026-20694 SandboxJS has a Sandbox Escape CVSS 3.1CRITICAL 10.0
  • TI-2026-20693 SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution CVSS 3.1CRITICAL 10.0
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences