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CVE-2026-25586

33
FAUCET Score

CVE-2026-25586 is a critical sandbox escape vulnerability affecting SandboxJS versions prior to 0.8.29. Attackers can bypass prototype whitelist enforcement by shadowing hasOwnProperty, gaining direct access to __proto__ and other blocked properties. This allows for host Object.prototype pollution and persistent cross-sandbox impact, with a CVSS score of 10.0 (CRITICAL). Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.8.29CPE matchmatch criteria
cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

10.0CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.64%
Probability of exploitation in next 30 days
EPSS Percentile
46.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0064 is in the 28th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @nyariv/sandboxjsFixed in: 0.8.29

Vendor Advisories (1)

npmGHSA-jjpw-65fv-8g48critical

@nyariv/sandboxjs has Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution

Feb 5, 2026

References

github.com / nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3
Patch
github.com / nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48
ExploitVendor Advisory