{"id":"CVE-2026-29791","aliases":["EUVD-2026-10070","GHSA-v2x6-wwfw-r2rq"],"status":"published","title":"Agentgateway: Missing parameter sanitization in MCP to OpenAPI conversion","description":"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":{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00168,"percentile":0.06087,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2026-03-05T01:02:47Z","modified":"2026-10-28T02:30:56Z","fixes":[{"ecosystem":"Go","package":"github.com/agentgateway/agentgateway","fixed_in":["0.12.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/agentgateway/agentgateway","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.12.0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/agentgateway/agentgateway","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.12.0"}]}]}],"products":[{"vendor":"agentgateway","product":"agentgateway"},{"vendor":"lfprojects","product":"agentgateway"}],"references":[{"url":"https://github.com/agentgateway/agentgateway/security/advisories/GHSA-v2x6-wwfw-r2rq","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/agentgateway/agentgateway/commit/9a5287569d892e77a8be8c3bb7bf3d7744244274","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29791","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-v2x6-wwfw-r2rq"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29791.json","tags":["advisory"]},{"url":"https://github.com/agentgateway/agentgateway","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-29791","title":"Agentgateway: Missing parameter sanitization in MCP to OpenAPI conversion","description":"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.","status":"published","published":"2026-03-06T20:39:40.852Z","modified":"2026-03-09T20:54:30.319Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-10070","description":"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.","status":"published","published":"2026-03-06T20:39:40Z","modified":"2026-03-09T20:54:30Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:48:06.014236Z"}],"ghsa":[{"id":"GHSA-v2x6-wwfw-r2rq","title":"Agentgateway is missing parameter sanitization in MCP to OpenAPI conversion","description":"### 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!","status":"published","published":"2026-03-05T01:02:47Z","modified":"2026-03-06T22:51:47Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:39:32.329372Z"}],"nvd":[{"id":"CVE-2026-29791","description":"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.","status":"published","published":"2026-03-06T21:16:15.787Z","modified":"2026-06-17T10:29:53.65Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:12:08.279852Z"}],"osv":[{"id":"CVE-2026-29791","title":"Agentgateway: Missing parameter sanitization in MCP to OpenAPI conversion","description":"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.","status":"published","published":"2026-03-06T20:39:40.852Z","modified":"2026-10-28T02:30:56.151298898Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:45:00.530889Z"},{"id":"GHSA-v2x6-wwfw-r2rq","title":"Agentgateway is missing parameter sanitization in MCP to OpenAPI conversion","description":"### 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!","status":"published","published":"2026-03-05T01:02:47Z","modified":"2026-03-06T23:01:26.649099Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:46:56.639206Z"}]}}