🛡️ Sentinel: [MEDIUM] Fix unbounded JSON load DoS risk by seonghobae · Pull Request #322 · ContextualWisdomLab/fast-mlsirm

seonghobae · 2026-07-27T07:16:40Z

This PR implements a security enhancement fixing a potential DoS vulnerability caused by unbounded memory allocation when loading JSON files. We replaced a standard read_text with an internal bounding function.

PR created automatically by Jules for task 9523418852988247737 started by @seonghobae

Summary by CodeRabbit

버그 수정
- 진단 보고서 JSON을 읽을 때 입력 크기와 중첩 깊이를 제한해, 매우 큰 파일로 인한 메모리 고갈 위험을 줄였습니다.
- JSON 파싱 동작을 일관된 제한 처리 방식으로 통합해 안정성을 향상했습니다.
문서
- 파일 기반 JSON 로딩 시 제한된 로더를 사용해야 한다는 보안 지침을 추가했습니다.

🚨 Severity: MEDIUM 💡 Vulnerability: Used `json.loads(source.read_text())` which can cause memory exhaustion DoS if parsing extremely large files. 🎯 Impact: An attacker could crash the app or exhaust system memory by providing an exceptionally large diagnostics report JSON. 🔧 Fix: Replaced `json.loads` with the internal `_load_json_bounded` function (imported from `fast_mlsirm.io`) which enforces a max bytes size. ✅ Verification: Ran `pytest tests/test_report.py` to ensure successful parsing behavior is preserved.

google-labs-jules · 2026-07-27T07:16:41Z

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coderabbitai · 2026-07-27T07:17:01Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 9914e30b-4966-43fb-b330-bdd9521bc65b

📥 Commits

Reviewing files that changed from the base of the PR and between a3123a2 and 9744835.

📒 Files selected for processing (2)

.jules/sentinel.md
python/fast_mlsirm/report.py

📝 Walkthrough

Walkthrough

진단 리포트 JSON 로딩을 _load_json_bounded로 변경하고, 전체 파일 로딩에 따른 메모리 고갈 DoS 위험 및 대응 지침을 문서화했습니다.

Changes

진단 JSON 로딩 제한

Layer / File(s)	Summary
제한된 진단 JSON 로딩 `.jules/sentinel.md`, `python/fast_mlsirm/report.py`	`render_diagnostics_report`가 `_load_json_bounded`를 통해 JSON을 로딩하며, 무제한 `read_text()` 및 `json.loads()` 사용에 대한 보안 지침이 추가되었습니다.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

ContextualWisdomLab/fast-mlsirm#299: 동일한 진단 JSON 파싱 경로의 제한 로딩 및 DoS 완화 변경과 직접적으로 관련됩니다.

Suggested reviewers: copilot

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	제목이 JSON 로딩의 무제한 메모리 할당 DoS 취약점 수정이라는 핵심 변경을 정확히 요약합니다.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Create PR with unit tests
Commit unit tests in branch sentinel-dos-fix-9523418852988247737

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Copilot

Pull request overview

This PR hardens the diagnostics HTML report renderer against potential Denial-of-Service scenarios by switching JSON ingestion to the project’s bounded JSON loader, aligning report generation with existing security hardening patterns.

Changes:

Replaced unbounded Path.read_text() + json.loads() with _load_json_bounded() when loading diagnostics JSON in render_diagnostics_report.
Documented the unbounded JSON load DoS risk and the preferred mitigation in the Sentinel security notes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
python/fast_mlsirm/report.py	Uses bounded JSON loading for report rendering inputs to prevent oversized payload ingestion.
.jules/sentinel.md	Adds a security learning entry documenting the JSON load DoS risk and the internal mitigation.

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 from pathlib import Path
 from typing import Any

+from .io import _load_json_bounded


 **Vulnerability:** MD5 hashing in `fast_mlsirm/report.py` triggered a high severity warning by Bandit, because by default it is assumed to be used for security purposes which is unsafe due to weak hashing.
 **Learning:** For non-security purposes like generating unique dom ids, `hashlib.md5()` triggers a vulnerability warning unless `usedforsecurity=False` is passed. This allows bypassing FIPS compliance limitations as well as suppressing false positive warnings.
 **Prevention:** Always add `usedforsecurity=False` parameter to `hashlib.md5` and other weak hashing functions unless they are genuinely used for secure cryptography (which they shouldn't be).
+## 2024-07-27 - Unbounded JSON Loading DoS Risk


seonghobae · 2026-07-29T12:43:34Z

중복 정리: report.py 무제한 JSON 로딩 DoS 수정으로, 리뷰 대기 중인 #203 과 동일 대상·동일 취지입니다. #203 을 대표로 남기고 닫습니다. 필요 시 재오픈 가능합니다.

Generated by Claude Code

google-labs-jules · 2026-07-29T12:45:20Z

중복 정리: report.py 무제한 JSON 로딩 DoS 수정으로, 리뷰 대기 중인 #203 과 동일 대상·동일 취지입니다. #203 을 대표로 남기고 닫습니다. 필요 시 재오픈 가능합니다.

Generated by Claude Code

이해했습니다. 작업이 중복되어 해당 작업은 중단하도록 하겠습니다. #203 을 통해 수정사항이 반영되기를 기대하겠습니다.

Copilot AI review requested due to automatic review settings July 27, 2026 07:16

Copilot started reviewing on behalf of seonghobae July 27, 2026 07:17 View session

Copilot AI reviewed Jul 27, 2026

View reviewed changes

This was referenced Jul 27, 2026

🛡️ Sentinel: [HIGH] JSON DoS 취약점 해결 #329

Closed

🛡️ Sentinel: [MEDIUM] Fix unbounded JSON loading in report generator #334

Closed

🛡️ Sentinel: [MEDIUM] Fix unbounded JSON loading #342

Closed

seonghobae closed this Jul 29, 2026

coderabbitai Bot mentioned this pull request Aug 4, 2026

fix(security): harden bounded JSON input handling #528

Merged

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🛡️ Sentinel: [MEDIUM] Fix unbounded JSON load DoS risk - #322

🛡️ Sentinel: [MEDIUM] Fix unbounded JSON load DoS risk#322
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