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Security audit

Jina AI

Security checks for vulnerabilities and agentic risk

Overview

The Jina AI workflow fits its purpose, but installation and automatic changes to other agent skills need review.

Review and verify the CLI before allowing installation. Check whether it automatically installs other agent skills, and disable synchronization if unwanted. Only submit content you intend to share with OOMOL and Jina AI. The package contains only instructions; the external installer and exact runtime release remain unverified.

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command installs software from an Oomol-controlled endpoint rather than performing Jina AI operations. No connection to Jina AI or necessity as a supporting implementation detail is established in the supplied code. The downloaded script's further behavior cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
87% confidence
Finding

The supplied code performs only an oo CLI login and contains no Jina AI interaction or connection between that login and Jina AI. Authentication could be a supporting implementation detail if such a connection were established, but the supplied chunk instead presents a materially different standalone behavior.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup instructions pipe a mutable remote script directly into Bash without inspecting it or verifying a pinned version, checksum, or signature; the PowerShell alternative has the same execution pattern. If the distribution endpoint or release pipeline is compromised, an agent following this fallback could execute attacker-controlled code with its local permissions, exposing accessible credentials and files; the missing-command condition reduces exposure but does not remove the risk.

Content

Scanner excerpt · SKILL.md (reported line 56)May include surrounding context.

The action workflow lacks a privacy warning about transmitting user content to external services.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The workflow instructs the agent to submit action payloads through OOMOL to Jina AI, including text, documents, and queries used for embedding or reranking. Although the services are named, the skill does not warn that supplied content leaves the user's environment, and it labels untagged actions safe to run directly despite their potential privacy impact.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 77)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources