# Lasso Security Review 2026: Features, Strengths and Gaps | SealGate

An honest Lasso Security review: what it is, where it is strong, and where it falls short for runtime agent data security, with a source-checked feature comparison against SealGate.

Source: https://sealgate.ai/comparison/lasso-security-review

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# Lasso Security review

What Lasso Security is, where it is strong, and where it falls short for securing AI agents and their tool calls. Every claim is drawn from Lasso Security's own public material, listed in Sources.

Last updated: September 2026

## What Lasso Security is

Lasso Security's MCP Gateway is a security-first, open-source proxy: runtime behavioral analysis, prompt-injection blocking, PII masking and tool reputation scoring.

## Where Lasso Security is strong

- Runtime enforcement. Blocks a dangerous tool call before it executes, not just after the fact.
- DLP, PII and secrets scanning. Inspects tool inputs and outputs for sensitive data at runtime.
- Prompt injection and tool-poisoning defense. Detects and stops injection, tool poisoning and rug-pull attacks.
- Tool-level policy. Read and write tiers, per-tool rules and human-in-the-loop approvals.
- Self-host, on-prem or VPC. Run it in your own environment for data residency.
- Open source core. An open, inspectable core rather than a closed proxy.

## Where Lasso Security falls short

Measured against a runtime agent data firewall. These are the gaps that matter if your priority is stopping data loss at the point of the tool call.

- SealGate adds a device-level agent and shadow MCP discovery; Lasso is a network and proxy layer with no on-device discovery.
- SealGate governs the agent CLI as well as MCP; Lasso governs MCP traffic only.
- SealGate tunnels local stdio servers in place; Lasso proxies stdio locally but does not keep and govern it as an on-device tunnel.

## Lasso Security vs SealGate, feature by feature

SealGate leads with the rows at the top, its clearest points of difference, then the parity rows every enterprise gateway is expected to cover.

| Capability | SealGate | Lasso Security |
| --- | --- | --- |
| How local stdio MCP servers are handled. Whether your local MCP server stays on the device or is shipped elsewhere. | Tunnel in place (Yes) | Direct proxy (Partial) |
| Local stdio servers stay on-device. The server keeps running on the machine, with no host-and-lift and no HTTP re-expose. | ✓ Yes | ~ Partial |
| Device-level management. An endpoint agent that discovers and governs MCP activity on the device itself. | ✓ Yes | ✕ No |
| Interface coverage. Whether the gateway governs only the MCP protocol, or the agent CLI and LLM API too. | MCP + CLI (Yes) | MCP only (No) |
| Runtime enforcement. Blocks a dangerous tool call before it executes, not just after the fact. | ✓ Yes | ✓ Yes |
| DLP, PII and secrets scanning. Inspects tool inputs and outputs for sensitive data at runtime. | ✓ Yes | ✓ Yes |
| Prompt injection and tool-poisoning defense. Detects and stops injection, tool poisoning and rug-pull attacks. | ✓ Yes | ✓ Yes |
| Gateway holds the credential. The gateway issues the final call so the agent cannot bypass policy and retry. | ✓ Yes | ~ Partial |
| Shadow MCP discovery. Finds unauthorized MCP servers before they are used. | ✓ Yes | ~ Partial |
| Provable per-call audit. A receipt for every call: agent, tool, policy version, result. | ✓ Yes | ~ Partial |
| SIEM integration and export. Streams audit events to Splunk, Sentinel and other SIEMs. | ✓ Yes | – Not publicly verified |
| SSO, SCIM and RBAC. Enterprise identity, group sync and role-based access. | ✓ Yes | ~ Partial |
| Tool-level policy. Read and write tiers, per-tool rules and human-in-the-loop approvals. | ✓ Yes | ✓ Yes |
| Self-host, on-prem or VPC. Run it in your own environment for data residency. | ✓ Yes | ✓ Yes |
| Compliance mapping. Evidence mapped to SOC 2, NIST AI RMF and the EU AI Act. | ~ Partial | ~ Partial |
| Low latency overhead. Minimal added latency on the tool-call path. | ✓ Yes | ~ Partial |
| Open source core. An open, inspectable core rather than a closed proxy. | ✕ No | ✓ Yes |

›

✓ Strong or native ~ Partial or via a partner ✕ Not offered – Not publicly verified

Bottom line: Lasso and SealGate are both runtime-security gateways; SealGate adds a device-level agent, shadow-MCP discovery, and agent-CLI coverage beyond the MCP proxy.

## How SealGate delivers this

The capabilities above are covered in depth on the product, security and deployment pages.

[How the SealGate gateway works](https://sealgate.ai/product) [Runtime DLP and prompt-injection defense](https://sealgate.ai/security) [Self-hosting and data residency](https://sealgate.ai/self-hosting)

## Evaluating Lasso Security for agent security?

See how SealGate blocks dangerous tool calls, scans for data loss, and keeps local servers on the device. Start free, or book a walkthrough.

[Start Free](https://dashboard.sealgate.ai) [Book a Demo](https://sealgate.ai/contact)

## Frequently asked questions

What is Lasso Security? Lasso Security's MCP Gateway is a security-first, open-source proxy: runtime behavioral analysis, prompt-injection blocking, PII masking and tool reputation scoring.

What are the main limitations of Lasso Security? The clearest gap for teams focused on runtime data security: SealGate adds a device-level agent and shadow MCP discovery; Lasso is a network and proxy layer with no on-device discovery. Weigh this against your own priorities before deciding.

Is Lasso Security worth it? It depends on the axis you care about. Lasso and SealGate are both runtime-security gateways; SealGate adds a device-level agent, shadow-MCP discovery, and agent-CLI coverage beyond the MCP proxy. Compare the two on the capabilities that matter to you.

## Sources

Claims about Lasso Security are drawn from its own public documentation, last reviewed September 2026. If something is out of date, tell us at [hello@sealgate.ai](mailto:hello@sealgate.ai) and we will correct it.

- [Lasso Security MCP Gateway (GitHub)](https://github.com/lasso-security/mcp-gateway)

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