How severe is GHSA-v2x6-wwfw-r2rq?

GHSA-v2x6-wwfw-r2rq has a CVSS score of 4.9/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-v2x6-wwfw-r2rq?

GHSA-v2x6-wwfw-r2rq affects the following packages: github.com/agentgateway/agentgateway (Go). Ecosystems affected: Go.

How do I fix GHSA-v2x6-wwfw-r2rq?

Update github.com/agentgateway/agentgateway to 0.12.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-v2x6-wwfw-r2rq is resolved across your whole dependency graph.

How do I detect GHSA-v2x6-wwfw-r2rq in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/agentgateway/agentgateway, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-v2x6-wwfw-r2rq if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-v2x6-wwfw-r2rq actively exploited in the wild?

No public exploit code has been indexed for GHSA-v2x6-wwfw-r2rq yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-v2x6-wwfw-r2rq?

GHSA-v2x6-wwfw-r2rq has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 6th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-v2x6-wwfw-r2rq?

GHSA-v2x6-wwfw-r2rq is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-v2x6-wwfw-r2rq published, and has it been updated?

GHSA-v2x6-wwfw-r2rq was published on March 5, 2026 and was last updated on March 6, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

MEDIUM severity

Agentgateway is missing parameter sanitization in MCP to OpenAPI conversionGHSA-v2x6-wwfw-r2rq

MEDIUMFix: agentgateway/agentgateway@9a52875

GHSA-v2x6-wwfw-r2rq is a medium-severity (CVSS 4.9) Improper Input Validation vulnerability in github.com/agentgateway/agentgateway. A fix is available for github.com/agentgateway/agentgateway — see the affected versions and patch details below.

Also known asCVE-2026-29791

Published

Mar 5, 2026

Updated

Mar 6, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-v2x6-wwfw-r2rq.

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs6th percentile — riskier than 6% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐹github.com/agentgateway/agentgateway

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

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!

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/agentgateway/agentgateway`	all versions	0.12.0`go get github.com/agentgateway/agentgateway@v0.12.0`

Affected Products

1 product · 1 configurations

Application

agentgatewaylfprojects

< 0.12.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/agentgateway/agentgateway, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/agentgateway/agentgateway to 0.12.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-v2x6-wwfw-r2rq is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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](https://agentgateway.dev/docs/standalone/latest/mcp/connect/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

O3 Security · Impact-Aware SCA

Is GHSA-v2x6-wwfw-r2rq in your dependencies?

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CVSS Score

4.9/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

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

CWE Classification

CWE-20Improper Input Validation

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Mar 5, 2026

Last updated

Mar 6, 2026

Identifiers

GHSA-v2x6-wwfw-r2rq

References

Advisorynvd.nist.gov · CVE 2026 29791 Webgithub.com · GHSA v2x6 wwfw r2rq Webgithub.com · 9a5287569d892e77a8be8c3bb7bf3d7744244274 Packagegithub.com · agentgateway

Related vulnerabilities

This CVE is medium severity; 6 of 8 other CVEs with CWE-20 are rated as high or higher (top: critical).

CVE-2026-118776CVE-2026-115779CVE-2026-125332CVE-2026-62662GHSA-fmc8-p6q7-75ccGHSA-pjff-c2wc-f6jmCVE-2026-44265CVE-2026-119280Browse all CWE-20

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedMar 6, 2026