# CVE-2026-18905: IBM ContextForge MCP Gateway is affected by server-side request forgery via DNS TOCTOU at tool invocation

> Remote authenticated attackers can exploit DNS rebinding to perform server-side request forgery and obtain sensitive information.

- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 4 Sep 2026
- **Also known as:** GHSA-p4cr-j9h3-9c8p

## What is CVE-2026-18905?

CVE-2026-18905 is a high-severity server-side request forgery vulnerability in IBM ContextForge MCP Gateway (`mcp-contextforge-gateway`), published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM ContextForge MCP Gateway (`mcp-contextforge-gateway`) <= v1.0.6 MCP Context Forge could allow a remote authenticated attacker to obtain sensitive information due to a DNS rebinding vulnerability during tool invocation.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-18905?

It affects 1 product.


Products: Ibm Contextforge.

## How do I fix CVE-2026-18905?

No fix has been published for CVE-2026-18905 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-18905 being exploited?

There is no known exploitation of CVE-2026-18905 in the wild and no public exploit code.

## Other vulnerabilities in IBM ContextForge MCP Gateway (`mcp-contextforge-gateway`)

- [CVE-2026-78573](https://insights.sbomify.com/CVE-2026-78573/): IBM ContextForge MCP Gateway is affected by use of default credentials (critical 9.8)
- [CVE-2026-18486](https://insights.sbomify.com/CVE-2026-18486/): IBM ContextForge MCP Gateway is affected by credential disclosure and privilege escalation via jq filter execution (high 8.8)
- [CVE-2026-77822](https://insights.sbomify.com/CVE-2026-77822/): Server-side request forgery in ContextForge MCP Gateway (high 8.2)
- [CVE-2026-18489](https://insights.sbomify.com/CVE-2026-18489/): IBM ContextForge Translate is affected by cross-client credential context confusion (high 7.4)
- [CVE-2026-77825](https://insights.sbomify.com/CVE-2026-77825/): IBM ContextForge MCP Gateway is affected by path traversal (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-18905 and fix it if it is affected.

What it is: CVE-2026-18905 is a high-severity server-side request forgery vulnerability in IBM ContextForge MCP Gateway (`mcp-contextforge-gateway`), published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-18905 in the wild and no public exploit code.

Affected product: IBM ContextForge MCP Gateway (`mcp-contextforge-gateway`). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-18905/ (Markdown: https://insights.sbomify.com/CVE-2026-18905/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18905
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18905
- OSV: https://osv.dev/vulnerability/CVE-2026-18905

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-18905/
Summaries are generated and may contain mistakes; the official description above is the record.