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CVE-2026-25641

SandboxJS has a sandbox escape via TOCTOU bug on keys in property accesses

Published: Feb 6, 2026Updated: Feb 18, 2026 Sources: CVE List NVD GHSACWE-367
NVD MITRE
10.0CVSSCRITICAL
EPSS Score
0.5%
Top 61.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, there is a sandbox escape vulnerability due to a mismatch between the key on which the validation is performed and the key used for accessing properties. Even though the key used in property accesses is annotated as string, this is never enforced. So, attackers can pass malicious objects that coerce to different string values when used, e.g., one for the time the key is sanitized using hasOwnProperty(key) and a different one for when the key is used for the actual property access. This vulnerability is fixed in 0.8.29.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-367

Affected Products

SandboxJSnyariv
On-prem
Security Products / vuln-mgmt-scanner
sandboxjsnyariv
On-prem
Security Products / vuln-mgmt-scanner
@nyariv/sandboxjsnpmOSS Libraries
nyarivindividual-devSecurity Productsaka sandboxjs
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-7x3h-rm86-3342
github.com
https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3
github.com
https://github.com/nyariv/SandboxJS/blob/6103d7147c4666fe48cfda58a4d5f37005b43754/src/executor.ts#L304-L304
github.com
and 2 more references View all →

Timeline

Published
Feb 6, 2026
Last Updated
Feb 18, 2026

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