# Security Review Report

**Branch**: feat/dashboard-visibility-overhaul -> main
**Date**: 2026-04-30T20:36
**Scope**: Incremental — 4 new commits since b477f51

## Issues in Your Changes (BLOCKING)

### CRITICAL
(none)

### HIGH
(none)

## Issues in Code You Touched (Should Fix)
(none)

## Pre-existing Issues (Not Blocking)
(none)

## Suggestions (Lower Confidence)
(none)

## Analysis Notes

The changes in this incremental review are security-clean. Detailed analysis per change area:

### 1. SQL Injection — `getSize()` (output-repository.ts:53-55)
The new `getSizeStmt` uses a parameterized prepared statement (`SELECT total_size FROM task_output WHERE task_id = ?`) with bind parameter, consistent with all other statements in this file. TaskId is a branded string type produced by the domain layer. No injection risk.

### 2. ANSI Escape Injection — already mitigated (use-task-output-stream.ts:67-68)
The existing `stripAnsi()` function with its comprehensive regex (CSI, OSC, DCS, C1 controls) already sanitizes task output before display. The new `codePointLength` and `codePointSlice` helpers operate on content that passes through `stripAnsi()` downstream in `buildStreamState()` (line 217). No new attack surface introduced.

### 3. Denial of Service via Memory — mitigated by design
The entire purpose of this PR is to reduce memory consumption:
- `getSize()` probe avoids loading full stdout blobs when size is unchanged.
- `codePointLength` / `codePointSlice` replace spread-based operations that allocated O(N) arrays.
- Liveness cache sweep prevents unbounded Map growth.
These are security improvements (availability), not regressions.

### 4. Map Mutation During Iteration — Cache Sweep (use-dashboard-data.ts:225-227)
The `for (const [id, entry] of cache) { if (...) cache.delete(id); }` pattern is safe in JavaScript. The ES2015 spec explicitly allows deletion of the current key during `Map.forEach` and `for...of` iteration without skipping entries or throwing. No correctness or security concern.

### 5. Graceful Degradation — getSize Error Path (use-task-output-stream.ts:397-407)
When `getSize()` returns an error Result, the code falls through to the full `get()` call. This is correct — a failed probe does not skip the data fetch or leave stale state. The `closingRef` guard on line 410 prevents state mutation after unmount. No data integrity risk.

### 6. No Secrets or Credentials
No hardcoded secrets, API keys, tokens, or credentials in any changed file. No environment variable changes. No authentication or authorization changes.

### 7. No New External Input Handling
All new functions operate on internal data (TaskId from domain, TaskOutput from SQLite). No new user-facing input parsing, no new network endpoints, no new file path construction from user input.

## Summary
| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 0 | 0 | 0 |
| Should Fix | 0 | 0 | 0 | 0 |
| Pre-existing | 0 | 0 | 0 | 0 |

**Security Score**: 9/10
**Recommendation**: APPROVED

The incremental changes are security-clean. SQL queries use parameterized statements. String utilities operate on already-sanitized internal data. The cache sweep uses a safe iteration pattern. The changes improve availability by reducing memory pressure (OOM fix). No new attack surface introduced.
