The GraphQL endpoint built its gqlgen server with bare handler.New and no limits, so a single request with thousands of aliased resolver calls was parsed, validated, executed, and marshalled in full. Under load this let an unauthenticated client drive excessive CPU and memory use against POST /api/connect/v1/graphql and the console and trust endpoints, which share the same constructor (GHSA-prh2-g8pv-m7p9). Add configurable guards in the shared gqlutils.NewHandler: a parser token limit rejects oversized queries at lex time before any execution, a fixed complexity limit caps field-selection count, an LRU query cache avoids repeated parsing, and field suggestions are disabled. The limits flow from a new APIConfig.GraphQL section through server and api config into all three GraphQL handlers, with PROBOD_API_GRAPHQL_* env vars and Helm values exposed for per-environment tuning. Defaults are sized with generous headroom over real traffic: the parser token limit (15000) and complexity limit (2000) sit far above the largest legitimate frontend query yet well below the proof-of-concept flood, so normal usage is unaffected while floods are rejected cheaply. Signed-off-by: Bryan Frimin <bryan@probo.com>
Probo
Open-source GRC platform for engineers.
Probo is a self-hostable governance, risk, and compliance (GRC) platform built for engineering and security teams. It covers the full GRC lifecycle: risk identification, control tracking, vendor risk, data privacy, access reviews, audit programs, and document approval workflows. Every entity is accessible through a web console, a CLI, a Model Context Protocol (MCP) API, and a GraphQL API, so you can automate compliance work from code, scripts, or any LLM agent.
Why Probo?
- AI-native by design. 270+ MCP tools expose every entity and operation. Any MCP-compatible LLM agent can read and write your GRC data, draft policies, run risk assessments, and generate evidence packs.
- Full GRC coverage. Risk management, controls, vendor risk, data privacy (DPIA/TIA), access reviews, audit programs.
- Multiple interfaces. Web console,
prbCLI (44+ command groups), MCP API, GraphQL, and an n8n community node for no-code automation. - Open source and self-hostable. ISC licensed. Run it on your own infrastructure with Docker.
- Audit-ready. Policy-based RBAC, immutable audit logs, electronic document sign-off workflows, and evidence chains.
Capabilities
| Domain | Features |
|---|---|
| Risk Management | Risk register, inherent/residual scoring, treatment strategies (mitigate, accept, avoid, transfer), threat-based risk assessments |
| Controls & Frameworks | Control library with maturity levels, custom framework import/export, Statement of Applicability (SoA) |
| Vendor / Third-Party Risk | Vendor inventory, automated website risk assessment, DPA/BAA tracking, subprocessor discovery |
| Data Privacy | DPIA, Transfer Impact Assessments, processing activity records, data inventory, rights requests (SAR/erasure) |
| Access Reviews | Campaign management, per-entry access decisions, integration with SaaS, cloud infra, and source code sources |
| Audit Programs | Audit scoping, control mapping, finding tracking, report generation |
| Evidence & Measures | Evidence collection (files and URLs), implementation state tracking, task assignment |
| Document Management | Versioned documents, approval quorums, electronic signatures, PDF export, bulk operations |
| Compliance Page | Public compliance portal, NDA management, certification publishing, custom domain support |
| Cookie & Consent | Cookie banner management, tracker detection, consent records |
Interfaces
Web console
The primary interface for day-to-day GRC work. Runs at http://localhost:8080 in development.
CLI (prb)
A fully-featured command-line client for scripting, automation, and CI/CD integration. Covers all 44+ resource types available in the web console.
# Authenticate
prb auth login
# List open risks
prb risk list
# Create a measure and link evidence
prb measure create --name "MFA enforced on all production systems"
prb evidence create --measure <id> --file screenshot.png
# Manage vendor compliance
prb thirdpartymgmt vendor list
prb thirdpartymgmt risk-assessment create --vendor <id>
Run prb help for the full command reference.
MCP API
Probo exposes 270+ MCP tools covering every entity and operation in the platform. Any MCP-compatible LLM agent (Claude, Cursor, Continue, and others) can connect directly and interact with your compliance data.
The full MCP specification is at pkg/server/api/mcp/v1/specification.yaml.
n8n node
The @probo/n8n-nodes-probo community node brings Probo into n8n workflows for no-code automation of compliance tasks over the GraphQL API.
Quick Start
Prerequisites
| Tool | Version |
|---|---|
| Go | 1.26+ |
| Node.js | 22+ |
| Docker | latest |
| mkcert | latest |
Steps
# 1. Clone with submodules
git clone --recurse-submodules https://github.com/getprobo/probo.git
cd probo
# 2. Install dependencies
go mod download
npm ci
# 3. Start infrastructure services (PostgreSQL, object storage, etc.)
make stack-up
# 4. Build
make build
# 5. Generate the local dev config
make dev-config
# 6. Run the server
bin/probod -cfg-file cfg/dev.yaml
The web console is available at http://localhost:8080.
See CONTRIBUTING.md for the full development environment walkthrough, including the frontend dev server and code generation steps.
Tech Stack
| Layer | Technologies |
|---|---|
| Backend | Go, PostgreSQL |
| API | GraphQL, MCP |
| Frontend | React, TypeScript, Relay, TailwindCSS |
| Infrastructure | Docker, GitHub Actions |
| Observability | OpenTelemetry, Grafana, Prometheus, Loki, Tempo |
Contributing
Contributions are welcome. Read CONTRIBUTING.md before opening a pull request. All commits require a Developer Certificate of Origin (DCO) sign-off (git commit -s). No CLA required.
To report a security vulnerability, email security@probo.com rather than opening a public issue. See SECURITY.md for the full disclosure policy.
Community
- Discord - Get help, share feedback, and talk to the team
- Documentation
- Blog
- Twitter / X
- Website
License
Probo is ISC licensed.