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AgentgatewayApplication · Lfprojects

CVE-2026-29791

MEDIUM · 6.5 CVSS v3.1 Published 2026-03-06
Fix available
A fix is available. Upgrade to 0.12.0 or later.
See remediation →
74/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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 · unedited
Agentgateway is an open source data plane for agentic AI connectivity within or across any agent framework or environment. Prior to version 0.12.0, when converting MCP tools/call request to OpenAPI request, input path, query, and header values are not sanitized. This issue has been patched in version 0.12.0.

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 confidence

Agentgateway fails to sanitize input path, query, and header values when converting MCP tools/call requests to OpenAPI requests. This lack of input validation could allow injection attacks or manipulation of HTTP requests during the conversion process.

MitigationUpgrade to version 0.12.0 or later, which includes the patch for proper input sanitization during MCP to OpenAPI conversion.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
AgentgatewayApplication
Affected:< 0.12.0

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
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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 checks

Work through these to decide whether this CVE applies to you.

  1. Check installed Agentgateway version
    Run 'pip show agentgateway' or check your package manager for the installed version. If using a container, check the image tag or inspect the container metadata.
    Affected if The installed version is below 0.12.0
  2. Identify if MCP tool conversions are in use
    Review your Agentgateway configuration or logs for any MCP (Model Context Protocol) tool or call request patterns. Look for endpoints or routes that handle MCP-to-OpenAPI conversions.
    Affected if MCP tool/call requests are being processed by the gateway
  3. Inspect input validation configuration
    Examine the Agentgateway configuration files (typically in /etc/agentgateway/ or the project config directory) for any input validation, sanitization, or filtering settings related to path, query, or header parameters.
    Affected if No input validation is explicitly configured for MCP conversions
  4. Check for suspicious request patterns in logs
    Review gateway access and error logs for unusual patterns in path, query, or header values that may indicate injection attempts during MCP conversions.
    Affected if Log entries show unexpected or malformed input values in MCP-related requests
  5. Verify gateway exposure
    Determine if the Agentgateway service is exposed to untrusted inputs. Check network configuration, firewall rules, and whether the gateway accepts requests from external or untrusted sources.
    Affected if The gateway accepts direct external input without an upstream filtering layer

You are affected if Agentgateway version is below 0.12.0 and the gateway processes MCP tool/call requests from untrusted or external sources.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 0.12.0 or later
Fixed in 0.12.0
Interim mitigation

Upgrade to version 0.12.0 or later, which includes the patch for proper input sanitization during MCP to OpenAPI conversion.

Recommended fix High confidence

version 0.12.0

  1. Upgrade Agentgateway to version 0.12.0 or later by updating your installation
  2. Verify the upgrade was successful by checking the installed version
  3. Test that MCP tool to OpenAPI request conversion works correctly with sanitized inputs
  4. Confirm path, query, and header values are now properly validated during conversion

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Agentgateway Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,080
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-29791 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data