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CVE-2026-25641

🚨 CRITICAL

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 acces...

Published
Feb 06, 2026
Last Modified
Feb 06, 2026
Views
10
Bookmarks
0

Description

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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 Scores

CVSS 3.1 10.0
10.0
CRITICAL
CVSS 2.0 10.0

References

github.com github.com github.com github.com

Additional Information

Source
security-advisories@github.com
State
Undergoing analysis

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