Sandbox escape / RCE in SandboxJS via unwrapped function return values
In SandboxJS (a JavaScript sandboxing library) versions prior to 0.8.29, the return values of functions executed in the sandbox are not wrapped with the library’s protective wrappers. This allows sandboxed code to leverage Object.values/Object.entries to obtain an Array that contains a reference to the host environment’s Function constructor. By then using Array.prototype.at to retrieve that constructor, an attacker can invoke the host Function constructor to execute arbitrary code outside of the sandbox, resulting in a full sandbox escape. The issue is fixed in SandboxJS 0.8.29.
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Impact, mitigation & remediation
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
8 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.
The version that knows your environment.
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.