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CVE-2026-25881 is a sandbox escape vulnerability in SandboxJS affecting versions prior to 0.8.31. The flaw is caused by improper handling of SandboxJS's isGlobal protection marker: when a protected host global prototype reference such as Map.prototype or Set.prototype is inserted into an array literal and later retrieved, the protection taint is stripped. This laundering of the protection state allows sandboxed code to directly modify host built-in prototypes from within the sandbox. The result is persistent host-side prototype pollution that breaks sandbox isolation and can alter subsequent host application behavior. In applications that later consume polluted properties in sensitive execution paths, the flaw can be leveraged toward remote code execution.
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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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vm2 sandbox escape CVE mentioned only as part of a historical list.
Unknown (listed as a trending CVE for SandboxJS without details in the provided content).
A critical SandboxJS sandbox-escape issue where global prototype references (e.g., Map.prototype/Set.prototype) lose a protection/taint flag when placed into and retrieved from an array, enabling prototype pollution of host-side built-ins and potentially leading to application-dependent remote code execution.
Unknown (only referenced as a critical SandboxJS flaw enabling host takeover; no technical details provided in the content).
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.