CVE-2026-25641 - SandboxJS has a sandbox escape via TOCTOU bug on keys in property accesses

CVE ID : CVE-2026-25641 Published : Feb. 6, 2026, 8:16 p.m. | 29 minutes ago 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. Severity: 10.0 | CRITICAL Visit the link for more details, such as CVSS details, affected products, timeline, and more...