Critical severity · published Feb 2, 2026
CVE-2026-25142
SandboxJS is a JavaScript sandboxing library
10.0
CVSS
1.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SA
Sandboxjs · Nyariv
before 0.8.27 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25142
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25142
Product
https://github.com/nyariv/SandboxJS/blob/f212a38fb5a6d4bc2bc2e2466c0c011ce8d41072/src/executor.ts#L368-L398
Patch
https://github.com/nyariv/SandboxJS/commit/75c8009db32e6829b0ad92ca13bf458178442bd3
Exploit
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-9p4w-fq8m-2hp7
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