Execution: sanitize v1 router log inputs (CWE-117) (PR #810)

[groupthinking]

Parent governance program

Focused execution unit under #898. PR #810 is the single canonical implementation and remains draft until exact-head review and provenance are valid.

Description

Prevent CR/LF log forging from user-controlled v1-router identifiers, messages, session IDs, and URLs while preserving useful diagnostics.

Agent login

claude

Agent run ID

session_01FZcDgrGTkknC2ya13Uy6bU

Declared file scope

• src/youtube_extension/backend/api/v1/router.py
• tests/unit/test_v1_router_extended.py

Focused test paths

• tests/unit/test_v1_router_extended.py

Acceptance criteria

• Refresh the existing fix(security): sanitize user-controlled values in API logs (CWE-117 log injection) #810 branch onto current main.
• Centralize safe log-value handling and apply it to every verified live v1-router user input.
• Add focused CR/LF and non-string regressions.
• Pass exact-head CI, Security Scan, CodeQL, Coverage, Secret Scan, and Dependency Review.
• Resolve all verified review threads: 0 unresolved.
• Produce an exact-head Vercel Preview; classified as web compatibility evidence, not Python runtime proof.
• Copilot reviewed 2/2 changed files on the exact head and produced no findings (2026-07-21T08:55:53Z).
• Resolve the historical pre-dispatch intent and trusted-agent-result policy boundary.
• Obtain final human review.

Execution receipt

• Canonical PR/branch: fix(security): sanitize user-controlled values in API logs (CWE-117 log injection) #810 / claude/determined-maxwell-raq7mg
• Agent login/run: claude / session_01FZcDgrGTkknC2ya13Uy6bU
• Exact head: d0d4b9844c00e8a7b15c99a6a70cbda554a9d648
• Base: main@2d660c7e5382db1df5c5eba39537aa9d034376bb; ahead 1, behind 0, mergeable.
• Changed files: src/youtube_extension/backend/api/v1/router.py, tests/unit/test_v1_router_extended.py.
• Focused evidence: 123 passed.
• GitHub Actions: Security Scan 29813525434, Coverage 29813525568, CodeQL 29813525507, CI 29813525515, Dependency Review 29813525500, and Secret Scan 29813525542 passed; E2E 29813525535 was repository-skipped.
• Review evidence: 0 unresolved threads; Copilot reviewed 2/2 changed files on the exact head and produced no findings at 2026-07-21T08:55:53Z.

Proven metadata and provenance contradiction

• The old issue body said fix(security): sanitize user-controlled values in API logs (CWE-117 log injection) #810 was 198 commits behind and unmergeable; the refreshed exact head is current and mergeable. That stale state is superseded by this receipt.
• Truth-gate run 29813853172 currently reports invalid_payload for issue.number, policy.agent_login, and policy.run_id; this body and the matching PR manifest repair those mutable fields.
• PR fix(security): sanitize user-controlled values in API logs (CWE-117 log injection) #810 was created 2026-07-17T01:58:10Z; this focused issue was created 2026-07-21T08:09:25Z. Any new intent snapshot necessarily postdates the PR and may expose an immutable historical-policy blocker.

Deployment evidence

• Exact-head Vercel deployment dpl_Fdpn7bMnQw7CWh9MXfo6BtLzjunh is READY and commit-verified.
• Vercel builds the Next.js apps/web root; this PR changes only Python backend/tests. The Preview proves web compatibility, not Python runtime behavior.
• Vercel production remains READY and has no runtime error clusters in the preceding 24 hours.

Next executable action

Mutable metadata is repaired, copilot-rabbit is present, current-head Copilot review is clean, and the truth gate was rerun. Keep draft. Freeze this exact body so the gate reports the historical snapshot boundary explicitly; a trusted claude terminal event and an authorized legacy-provenance disposition remain required.

Safety

No merge, ruleset weakening, fabricated agent identity, credential mutation, production change, or branch deletion is authorized.

[linear-code]

MYX-95

[github-actions]

👋 Thanks for opening this issue! It has been automatically labeled for triage.

[coderabbitai]

🔗 Related PRs

#277 - Vercel remediation complete: waitUntil adoption + active middleware + @vercel/functions package (resolves three user-defined outcomes; 16-agent verification-gate consolidated PASS on full matrix) [closed]
#404 - fix(web): sync package-lock with @vercel/functions (unblocks #277 auto-merge) [merged]
#605 - fix(follow-up): correct Trivy commit pin + broaden YouTube host allowlist (CodeRabbit findings on merged #604) [merged]
#648 - fix: address CodeRabbit review findings on merged perf pass (#642) [merged]

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