Fetch the full advisory record for an OSV vulnerability ID. Returns the complete record: summary, full details text, CVE aliases, all affected packages and version ranges, fix versions, CVSS severity vectors, CWE weakness IDs, and references. Use when osv_query or osv_query_batch returns a vuln I...
Part of the Osv Advisory Mcp Server server.
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AI agents call osv_get_vulnerability to retrieve information from Osv Advisory Mcp Server without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though osv_get_vulnerability only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"osv_get_vulnerability": {}
}
}See the full Osv Advisory Mcp Server policy for all 4 tools.
These attack patterns abuse exactly the kind of access osv_get_vulnerability gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Fetch the full advisory record for an OSV vulnerability ID. Returns the complete record: summary, full details text, CVE aliases, all affected packages and version ranges, fix versions, CVSS severity vectors, CWE weakness IDs, and references. Use when osv_query or osv_query_batch returns a vuln ID and you need the full advisory context — eligibility criteria, scope of affected packages, or remediation guidance.. It is categorised as a Read tool in the Osv Advisory Mcp Server MCP Server, which means it retrieves data without modifying state.
Register the Osv Advisory Mcp Server MCP server in PolicyLayer and add a rule for osv_get_vulnerability: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Osv Advisory Mcp Server. Nothing to install.
osv_get_vulnerability is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the osv_get_vulnerability rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for osv_get_vulnerability. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
osv_get_vulnerability is provided by the Osv Advisory Mcp Server MCP server (@cyanheads/osv-advisory-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Osv Advisory Mcp Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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