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----
-title: "Exec target override bypass fix"
-summary: "Hardened exec target resolution so auto defaults no longer allow model-requested host overrides."
-author: "Codex <codex@openai.com>"
-github_username: "codex"
-created: "2026-03-29"
----
-
-Investigated a high-severity regression in exec target resolution.
-
-What changed:
-
-- Confirmed current behavior allowed `configuredTarget=auto` with `requestedTarget=gateway/node`, which selects host execution even when sandbox is available.
-- Restored fail-closed allowlist behavior by requiring requested target to exactly match configured target.
-- Updated the runtime unit test to verify host overrides are rejected when configured target is `auto`.
-
-Why:
-
-- `auto` should choose runtime host automatically, not grant untrusted host-selection overrides.