# Security and privacy

Patterns, flags, replacement templates, subjects and imported projects are
untrusted.

- Syntax and execution use separate workers.
- Regex execution never occurs on the UI thread.
- Timeout, crash and cancellation terminate the worker.
- A terminated worker is never reused.
- Pattern, subject, replacement/list template, match, capture and output sizes
  are bounded.
- Replacement templates are strings; executable callbacks are unavailable.
- Replacement/list token decorations, rows, chips, diagnostics and list
  evaluation work have separate presentation/operation caps; incomplete list
  results cannot be exported.
- Per-match replacement mapping executes no user code and is capped at 200
  matches, 2,000 materialized contributions and 50,000 token evaluations.
- Imported JSON is aggregate-size-bounded before parsing, then field-validated
  and never evaluated or auto-run. Export and IndexedDB save apply the same
  32 MiB aggregate UTF-8 document bound before materialization or persistence.
- Project and standalone-suite test subjects are not exported by default, and
  unit-test subjects require a separate opt-in before IndexedDB persistence.
- Unit-test add, update, clone and append-import paths share 1,000-case and
  32 MiB aggregate state caps.
- Unit-test assertion diagnostics never stringify complete large values and
  retain at most 2 KiB UTF-8 per case. Oversized replacement output is not
  copied into an exact current-result draft.
- No backend, uploads, telemetry, remote corpus URL, CDN, remote font, `eval`,
  `Function`, arbitrary command line or unsafe HTML rendering exists.

Version 0.1.0 needs a CSP equivalent to:

```text
default-src 'self';
script-src 'self';
worker-src 'self' blob:;
connect-src 'self';
img-src 'self' data:;
font-src 'self';
style-src 'self' 'unsafe-inline';
object-src 'none';
frame-src 'none';
base-uri 'none';
form-action 'none';
```

The Toolbox shell currently requires inline styles. No `unsafe-eval` or
`wasm-unsafe-eval` is required until an actual WebAssembly flavour ships.

Report vulnerabilities privately to the repository owner before public issue
details are posted.