A sandboxed session could use cross-agent sessions_spawn to create a child under an agent configured with sandbox.mode="off", downgrading runtime confinement.
In mixed-agent setups that allow cross-agent spawning, a sandboxed requester could escape into an unsandboxed child runtime.
Spawn-time sandbox inheritance is now enforced: if the requester is sandboxed and the resolved child runtime would be unsandboxed, spawn is rejected.
<= 2026.2.262026.3.1{
"github_reviewed": true,
"github_reviewed_at": "2026-03-02T21:53:45Z",
"severity": "MODERATE",
"nvd_published_at": null,
"cwe_ids": [
"CWE-269",
"CWE-284",
"CWE-732"
]
}