CVE-2026-49257
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedmcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot. In versions 3.0.1 and below, mcp-pinot defaults to running an HTTP MCP server bound to 0.0.0.0:8080 with no authentication enabled. All MCP tools, including SQL query execution, schema creation, and table-config mutation, are reachable by any network-adjacent caller. The server proxies these calls using server-side Pinot credentials, producing a confused-deputy condition that yields full read/write access to the configured Pinot cluster. This issue has been fixed in version 3.1.0
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidencemcp-pinot versions 3.0.1 and below run an unauthenticated HTTP MCP server bound to 0.0.0.0:8080, exposing all MCP tools (SQL execution, schema creation, table-config mutation) to any network-adjacent caller. The server proxies requests using its own Pinot credentials, creating a confused-deputy condition that grants attackers full read/write access to the configured Pinot cluster.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if mcp-pinot is installed or runningCheck for mcp-pinot processes or packages: look for 'mcp-pinot' in running processes, installed npm packages (npm list -g mcp-pinot), or Python packages (pip list | grep mcp-pinot). Also check for services or containers referencing pinot-mcp.Affected if mcp-pinot is found installed or running on the system
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Determine the installed version of mcp-pinotRun the package manager command to get the version: for npm use 'npm list -g mcp-pinot', for pip use 'pip show mcp-pinot' or check package.json. Compare the version number to the affected range (3.0.1 and below).Affected if The installed version is 3.0.1 or lower, or if version cannot be determined but mcp-pinot is present
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Verify if HTTP server is listening on port 8080Run 'netstat -tuln | grep 8080' or 'ss -tuln | grep 8080' to check if port 8080 is open and listening. Alternatively, use a port scanner from another host on the same network to test TCP connectivity to port 8080.Affected if Port 8080 is open and accepting connections, indicating the vulnerable HTTP server is active
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Confirm the server binds to all network interfacesCheck the mcp-pinot configuration file or running process parameters for the bind address. If logs or config show binding to 0.0.0.0:8080, the server is exposed to network access.Affected if The HTTP server binds to 0.0.0.0:8080 (all interfaces) rather than localhost (127.0.0.1:8080)
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Check for authentication configurationInspect the mcp-pinot configuration files (look for config.json, config.yaml, or similar in the mcp-pinot working directory) for authentication-related settings such as API keys, tokens, or auth-enabled flags. Also check if environment variables for authentication are set.Affected if No authentication mechanism is configured or enabled in the mcp-pinot setup
A user is affected if mcp-pinot version 3.0.1 or lower is installed, the HTTP server is listening on port 8080 bound to 0.0.0.0, and no authentication is configured, allowing unauthenticated network access to the Pinot cluster.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade to version 3.1.0 or later which includes authentication. If immediate upgrade is not feasible, restrict network access to the MCP server port using firewall rules or network segmentation.
3.1.0
- Check the currently installed version of mcp-pinot using: pip show mcp-pinot or pip list | grep mcp-pinot
- Upgrade to version 3.1.0 or later using: pip install --upgrade mcp-pinot
- Verify the upgrade was successful by checking the installed version: pip show mcp-pinot
- Review the release notes or changelog for version 3.1.0 to understand what authentication mechanisms are now enabled and configure accordingly
- If running in production, update any deployment scripts or container configurations to use version 3.1.0 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-49257 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-49257 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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