# QA Final Validation Report — Security Remediation 2026-03-20

**Date:** 2026-03-20
**Auditor:** QA Security Auditor (automated)
**Scope:** Code changes and SECURITY.md updates from today's security remediation session

---

## Summary

| Check | Result |
|-------|--------|
| Code changes verified | PASS |
| SECURITY.md structure verified | PASS |
| Build (`go build`, `go vet`) | PASS |
| Pre-commit hooks | N/A — config missing (see note) |
| Go tests (mail + docker services) | PASS |
| **Overall** | **PASS** |

---

## Step 1: Code Change Verification

### 1.1 `Dockerfile` — Go version bump

| Item | Expected | Actual | Result |
|------|----------|--------|--------|
| Line 13 | `ARG GO_VERSION=1.26.2` | `ARG GO_VERSION=1.26.2` | ✅ PASS |

### 1.2 `backend/internal/services/mail_service.go` — gosec suppression

| Item | Expected | Actual | Result |
|------|----------|--------|--------|
| `#nosec G203` comment present | Yes | `// #nosec G203 -- html/template.Execute auto-escapes all EmailTemplateData fields; this cast prevents double-escaping in the outer layout.` | ✅ PASS |
| `//nolint:gosec` annotation present | Yes | `//nolint:gosec // see above` | ✅ PASS |
| Comment mentions auto-escaping justification | Yes | Present — cites `html/template.Execute` auto-escaping and double-escaping prevention | ✅ PASS |

### 1.3 `backend/internal/services/docker_service_test.go` — file permission

| Item | Expected | Actual | Result |
|------|----------|--------|--------|
| `os.WriteFile` permission (~line 231) | `0o600` | `0o600` | ✅ PASS |

---

## Step 2: SECURITY.md Structure Verification

| Check | Expected | Result |
|-------|----------|--------|
| Section order | Preamble → Known Vulnerabilities → Patched Vulnerabilities → supporting sections | ✅ PASS |
| CVE-2025-68121 ID field | `CVE-2025-68121 (see also CHARON-2025-001)` | ✅ PASS |
| CVE-2025-68121 Severity | Critical | ✅ PASS |
| CVE-2026-2673 present in Known Vulnerabilities | Yes | ✅ PASS |
| CVE-2026-2673 Severity | High | ✅ PASS (`High · 7.5`) |
| CVE-2026-2673 Status | Awaiting Upstream | ✅ PASS |
| CHARON-2025-001 mentions Go 1.25.1 as cluster origin | Yes | ✅ PASS |
| CHARON-2025-001 mentions Go 1.25.6/1.25.7 partial fixes | Yes | ✅ PASS |
| CHARON-2025-001 identifies CVE-2025-68121 as Critical | Yes | ✅ PASS |
| CHARON-2025-001 states resolution requires Go ≥ 1.26.2 | Yes | ✅ PASS |
| CHARON-2026-001 present in Patched (not Known) | Yes | ✅ PASS |
| CHARON-2026-001 Resolution links `docs/plans/alpine_migration_spec.md` | Yes | ✅ PASS |
| CHARON-2026-001 Resolution links `docs/security/advisory_2026-02-04_debian_cves_temporary.md` | Yes | ✅ PASS |
| CVE-2025-68156 present in Patched | Yes | ✅ PASS |

---

## Step 3: Build Verification

**Command:** `cd /projects/Charon/backend && go build ./... && go vet ./...`

| Result | Details |
|--------|---------|
| Exit code | 0 |
| Build errors | None |
| Vet warnings | None |
| **PASS** | Clean build and vet with zero diagnostics |

---

## Step 4: Pre-commit Hooks

**Command:** `cd /projects/Charon && pre-commit run --all-files`

| Result | Details |
|--------|---------|
| Exit code | Non-zero (fatal) |
| Error | `InvalidConfigError: .pre-commit-config.yaml is not a file` |
| Hooks executed | 0 |
| **STATUS: N/A** | `.pre-commit-config.yaml` does not exist in the workspace. No regressions can be inferred; pre-commit infrastructure is absent, not broken by today's changes. |

> **Note:** The absence of `.pre-commit-config.yaml` is a pre-existing infrastructure gap, not a regression introduced by today's session. No hooks (go-vet, golangci-lint, eslint, prettier, gitleaks, etc.) could be evaluated via this pathway. The Go build/vet and test steps below serve as a substitute for the Go-related hooks.

---

## Step 5: Go Tests for Modified Files

### 5.1 Mail Service Tests

**Command:** `cd /projects/Charon/backend && go test ./internal/services/... -run "TestMail" -v`

| Test | Result |
|------|--------|
| TestMailService_SendEmail_CRLFInjection_Comprehensive | PASS |
| TestMailService_BuildEmail_UndisclosedRecipients | PASS |
| TestMailService_SendInvite_HTMLTemplateEscaping | PASS |
| TestMailService_SendInvite_CRLFInjection | PASS |
| TestMailService_GetSMTPConfig_DBError | PASS |
| TestMailService_GetSMTPConfig_InvalidPortFallback | PASS |
| TestMailService_BuildEmail_NilAddressValidation | PASS |
| TestMailService_sendSSL_DialFailure | PASS |
| TestMailService_sendSTARTTLS_DialFailure | PASS |
| TestMailService_TestConnection_StartTLSSuccessWithAuth | PASS |
| TestMailService_TestConnection_NoneSuccess | PASS |
| TestMailService_SendEmail_STARTTLSSuccess | PASS |
| TestMailService_SendEmail_SSLSuccess | PASS |
| TestMailService_SendEmail_ContextCancelled | PASS |
| **Package result** | `ok` in 0.594s |

Two benign teardown warnings appeared (`failed to close smtp client/tls conn: use of closed network connection`) — expected test-cleanup noise, did not cause failures.

### 5.2 Docker Service Tests

**Command:** `cd /projects/Charon/backend && go test ./internal/services/... -run "TestBuildLocalDocker" -v`

| Test | Result |
|------|--------|
| TestBuildLocalDockerUnavailableDetails_PermissionDeniedIncludesGroupHint | PASS |
| TestBuildLocalDockerUnavailableDetails_MissingSocket | PASS |
| TestBuildLocalDockerUnavailableDetails_PermissionDeniedSocketGIDInGroups | PASS |
| TestBuildLocalDockerUnavailableDetails_PermissionDeniedStatFails | PASS |
| TestBuildLocalDockerUnavailableDetails_ConnectionRefused | PASS |
| TestBuildLocalDockerUnavailableDetails_GenericError | PASS |
| TestBuildLocalDockerUnavailableDetails_OsErrNotExist | PASS |
| TestBuildLocalDockerUnavailableDetails_NonUnixHost | PASS |
| TestBuildLocalDockerUnavailableDetails_EPERMWithStatFail | PASS |
| **Package result** | `ok` in 0.168s |

---

## Issues / Blocking Findings

None. All verifiable checks passed.

### Non-blocking Notes

1. **Pre-commit config absent** — `.pre-commit-config.yaml` does not exist; pre-commit hooks cannot run. This is a pre-existing gap, not introduced by today's session. Recommend creating a pre-commit config to enable linting gates.
2. **`TestDocker` pattern produced no matches** — the actual docker service test functions follow the naming pattern `TestBuildLocalDockerUnavailableDetails_*`. The pattern in the original mission brief was too narrow; tests were re-run with the correct pattern and all passed.

---

## Overall

**PASS** — All code changes are correctly applied, SECURITY.md structure meets all specified criteria, the backend builds and vets cleanly, and all relevant unit tests pass with zero failures.