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BAML — agentic threat model

6.3AIVSS 6.3 · Medium

BAML is an open-source agent framework focusing on structured LLM outputs and schema-aligned parsing. Its primary security risks stem from parser vulnerabilities or injection attacks that bypass schema constraints in downstream applications.

OWASP AIVSS score rationale

AIVSS = (CVSS_Base + AARS) × Mitigation_Factor, where AARS = (10 − CVSS_Base) × (Factor_Sum / 10) × ThM
CVSS base 6.3AARS uplift 0.74Factor sum 2.0/10Threat ×1.0Mitigation ×0.9
Autonomy of Action
0.10
Goal-Driven Planning
0.20
Self-Modification
0.00
Dynamic Tool Use
0.20
Persistent Memory
0.10
Contextual Awareness
0.40
Dynamic Identity
0.00
Multi-Agent Interactions
0.20
Non-Determinism
0.50
Opacity & Reflexivity
0.30

Scored with the canonical OWASP AIVSS formula (AIVSS calculator reference); agentic risk factors estimated from the agent’s described capabilities.

MAESTRO 7-layer threat model

Per-layer threats for this agent. Layers tagged “not certain from listing” are general, caveated commentary where the public description didn’t pin that layer.

L1 · Foundation Models✓ mapped

BAML acts as an abstraction layer over various foundation models (OpenAI, Anthropic, Gemini, Bedrock, vLLM). While it mitigates mis-aligned outputs through schema-aligned parsing (SAP), it remains susceptible to upstream model vulnerabilities, adversarial prompt injections that bypass parsing logic, and model-level denial of service.

L2 · Data Operations⚠ not certain from listing

Not certain from the listing — BAML focuses on structured outputs and model interfacing rather than data ingestion, vector databases, or RAG pipelines. Gaps in data lineage or poisoning of the data fed into BAML schemas would depend entirely on the user's implementation.

L3 · Agent Frameworks✓ mapped

As an orchestration framework, BAML's primary threat lies in parser bypasses or vulnerabilities within its Rust-based schema-aligned parsing engine. If an attacker can craft inputs that exploit the parser, they could cause application crashes or inject unexpected structured data into downstream business logic.

L4 · Deployment & Infrastructure⚠ not certain from listing

Not certain from the listing — BAML is an open-source library integrated into host applications. Infrastructure security, sandboxing of model calls, and secret management for LLM API keys are left to the deploying developer's environment.

L5 · Evaluation & Observability✓ mapped

BAML provides lifecycle management including monitoring. However, security teams must ensure that monitoring logs do not leak sensitive user data or API keys, and that logging mechanisms cannot be tampered with by adversarial model outputs.

L6 · Security & Compliance (cross-cutting)⚠ not certain from listing

Not certain from the listing — BAML is a free, open-source developer tool and does not explicitly advertise built-in compliance certifications (like SOC2 or ISO 27001) or enterprise access control policies in its basic directory listing.

L7 · Agent Ecosystem⚠ not certain from listing

Not certain from the listing — While BAML can be used to build agents, the listing does not detail native multi-agent orchestration protocols, agent-to-agent trust boundaries, or marketplace integrations.

MAESTRO — the 7-layer agentic threat-modeling framework (Cloud Security Alliance / Ken Huang).