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CVE-2026-25520 is a critical sandbox escape vulnerability in SandboxJS, a JavaScript sandboxing library. In affected versions prior to 0.8.29, return values produced by functions are not wrapped by the library’s sandbox protections. This allows attacker-controlled code running inside the sandbox to use Object.values or Object.entries to obtain an Array containing the host environment’s Function constructor. By then using Array.prototype.at to retrieve that constructor, the attacker can invoke the host Function constructor directly and execute arbitrary code outside the intended sandbox boundary. The flaw therefore breaks the core isolation guarantees of SandboxJS and enables execution in the host context rather than the restricted sandbox context.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
SandboxJS sandbox escape leading to arbitrary code execution on the host by leveraging unwrapped function return values to reach the host Function constructor.
Sandbox escape leading to arbitrary code execution outside the SandboxJS JavaScript sandbox due to unwrapped function return values enabling access to the host Function constructor.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.