Vulnerability-Lookup

CVE-2026-29791 (GCVE-0-2026-29791)

Vulnerability from cvelistv5 – Published: 2026-03-06 20:39 – Updated: 2026-03-09 20:54

Title

Agentgateway: Missing parameter sanitization in MCP to OpenAPI conversion

Summary

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.

Severity ?

4.9 (Medium)


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

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M

References

URL

Tags

https://github.com/agentgateway/agentgateway/secu…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	agentgateway	agentgateway	Affected: < 0.12.0

Show details on NVD website

JSON

To clipboard

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GHSA-V2X6-WWFW-R2RQ

Vulnerability from github – Published: 2026-03-05 01:02 – Updated: 2026-03-06 22:51

Summary

Agentgateway is missing parameter sanitization in MCP to OpenAPI conversion

Details

Summary

When converting MCP tools/call request to OpenAPI request, input path, query, and header values are not sanitized.

Details

When using the MCP to OpenAPI feature, the proxy lacks proper sanitization of input parameters in the MCP call, allowing: * Injection of additional path or query parameters. * Injection of additional headers.

Impacted Versions

This vulnerability is fixed in Agentgateway v0.12.0+. Users on older versions are recommended to upgrade to v0.12.0+.

This feature only impacts usage of the MCP to OpenAPI feature

Credits

Agentgateway extends its thanks to @spacewander for the report!

Severity ?

4.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/agentgateway/agentgateway"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.12.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29791"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-05T01:02:47Z",
    "nvd_published_at": "2026-03-06T21:16:15Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nWhen converting MCP `tools/call` request to OpenAPI request, input path, query, and header values are not sanitized.\n\n### Details\n\nWhen using the [MCP to OpenAPI](https://agentgateway.dev/docs/standalone/latest/mcp/connect/openapi/) feature, the proxy lacks proper sanitization of input parameters in the MCP call, allowing:\n* Injection of additional path or query parameters.\n* Injection of additional headers.\n\n### Impacted Versions\n\nThis vulnerability is fixed in Agentgateway v0.12.0+. Users on older versions are recommended to upgrade to v0.12.0+.\n\nThis feature only impacts usage of the [MCP to OpenAPI](https://agentgateway.dev/docs/standalone/latest/mcp/connect/openapi/) feature\n\n### Credits\n\nAgentgateway extends its thanks to @spacewander for the report!",
  "id": "GHSA-v2x6-wwfw-r2rq",
  "modified": "2026-03-06T22:51:46Z",
  "published": "2026-03-05T01:02:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/agentgateway/agentgateway/security/advisories/GHSA-v2x6-wwfw-r2rq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29791"
    },
    {
      "type": "WEB",
      "url": "https://github.com/agentgateway/agentgateway/commit/9a5287569d892e77a8be8c3bb7bf3d7744244274"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/agentgateway/agentgateway"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Agentgateway is missing parameter sanitization in MCP to OpenAPI conversion"
}

FKIE_CVE-2026-29791

Vulnerability from fkie_nvd - Published: 2026-03-06 21:16 - Updated: 2026-03-18 19:03

Severity ?

4.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/agentgateway/agentgateway/security/advisories/GHSA-v2x6-wwfw-r2rq	Vendor Advisory

Impacted products

	Vendor	Product	Version
	lfprojects	agentgateway	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:lfprojects:agentgateway:*:*:*:*:*:*:*:*",
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    },
    {
      "lang": "es",
      "value": "Agentgateway es un plano de datos de c\u00f3digo abierto para la conectividad de IA ag\u00e9ntica dentro o a trav\u00e9s de cualquier framework o entorno de agente. Antes de la versi\u00f3n 0.12.0, al convertir solicitudes de herramientas/llamadas MCP a solicitudes OpenAPI, los valores de ruta de entrada, consulta y encabezado no se desinfectan. Este problema ha sido parcheado en la versi\u00f3n 0.12.0."
    }
  ],
  "id": "CVE-2026-29791",
  "lastModified": "2026-03-18T19:03:44.357",
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-29791 (GCVE-0-2026-29791)

GHSA-V2X6-WWFW-R2RQ

Summary

Details

Impacted Versions

Credits

FKIE_CVE-2026-29791

Tags

Sightings

Nomenclature