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CVE-2026-25586
ANC
Critical

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object…

CVSS
10.0
Critical
EPSS
0.00
p10
Published
2026-01-01
Updated
2026-01-01
Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.

Tags · CWE
Pre-auth
CWE-74
CAPEC-3
CAPEC-6
CAPEC-7
CAPEC-8
CAPEC-9
CAPEC-10
CAPEC-13
CAPEC-14
CAPEC-24
CAPEC-28
CAPEC-34
CAPEC-42
CAPEC-43
CAPEC-45
CAPEC-46
CAPEC-47
CAPEC-51
CAPEC-52
CAPEC-53
CAPEC-64
CAPEC-67
CAPEC-71
CAPEC-72
CAPEC-76
CAPEC-78
CAPEC-79
CAPEC-80
CAPEC-83
CAPEC-84
CAPEC-101
CAPEC-105
CAPEC-108
CAPEC-120
CAPEC-135
CAPEC-250
CAPEC-267
CAPEC-273
Affected products
Sandboxjs < 0.8.29
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Timeline
2026-01-01
Published
2026-01-01
Updated
CVSS 3.1 breakdown
Attack Vector
AV: N
Network (N)
Attack Complexity
AC: L
Low (L)
Privileges Required
PR: N
None (N)
User Interaction
UI: N
None (N)
Scope
S: C
Changed (C)
Confidentiality Impact
C: H
High (H)
Integrity Impact
I: H
High (H)
Availability Impact
A: H
High (H)
Exploit indicators
EPSS
0.000 · p10
Known exploited (KEV)
No
MITRE ATT&CK
Inferred via CAPEC
Known exploits — Сканер-ВС
No Сканер-ВС checks registered for this vulnerability yet.
Affected software
ProductVendorStatus
Tracked
sandboxjs*Tracked