# CVE-2026-19373: PhialsBasement KoboldCPP-MCP-Server BaseConfigSchema index.ts makeRequest server-side request forgery

> Attackers can exploit a server-side request forgery vulnerability in the makeRequest function to access internal resources or bypass security controls.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Aug 2026
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-m2hf-r4mh-rrq8

## What is CVE-2026-19373?

CVE-2026-19373 is a medium-severity server-side request forgery vulnerability in PhialsBasement KoboldCPP-MCP-Server, published on 9 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A weakness has been identified in PhialsBasement KoboldCPP-MCP-Server 1.0.0. Affected by this issue is the function makeRequest of the file src/index.ts of the component BaseConfigSchema. Executing a manipulation of the argument apiUrl can lead to server-side request forgery. It is possible to launch the attack on the local host. The project was informed of the problem early through an issue report but has not responded yet.

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

## Which versions are affected by CVE-2026-19373?


## How do I fix CVE-2026-19373?

No fix has been published for CVE-2026-19373 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19373 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19373 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19373 and fix it if it is affected.

What it is: CVE-2026-19373 is a medium-severity server-side request forgery vulnerability in PhialsBasement KoboldCPP-MCP-Server, published on 9 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19373 exists.

Affected product: PhialsBasement KoboldCPP-MCP-Server. 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-2026-19373/ (Markdown: https://insights.sbomify.com/CVE-2026-19373/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19373
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19373
- OSV: https://osv.dev/vulnerability/CVE-2026-19373

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-19373/
Summaries are generated and may contain mistakes; the official description above is the record.