Fail-closed defaults
When a safeguard is unavailable, the action stops instead of going ahead.
Layer L2 Harness · Owner Agent framework vendor · Family Isolation and network
By risk
| Risk | Held | Failed | Got around | Missing | Not mentioned |
|---|---|---|---|---|---|
| Agent takes destructive or unapproved actions | – | – | – | – | 3 |
| Agent escapes its sandbox | – | 1 | 1 | 1 | 4 |
Why it did not hold
| Most common reason | Incidents | Example |
|---|---|---|
| Fell back to an unsafe default | 1 | “This flaw stems from a failure in the platform’s sandbox mechanism.” LR-2026-0138 |
By quarter
| Period | Held | Failed | Got around | Missing |
|---|---|---|---|---|
| 2025-Q3 | – | – | – | – |
| 2025-Q4 | – | – | – | – |
| 2026-Q1 | – | – | – | – |
| 2026-Q2 | – | – | – | – |
| 2026-Q3 | – | – | – | – |
| 2026-Q4 | – | 1 | 1 | 1 |
Added in reported fixes, and what followed
No reported fix names this control yet.
Frameworks
| Framework | Item | Text |
|---|---|---|
| NIST SP 800-53 | SC-24 | To verify when the text is stored |