CVE-2026-43898
SandboxJS: Sandbox escape via Function.caller leakage of internal call op
Vexday Risk Score
28Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 10EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
28 May 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products
nyariv · SandboxJSWant to know if your infrastructure is exposed to this?
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