# CVE-2026-41859: Weak cryptography in BOSH

> A man-in-the-middle attacker can steal BOSH director credentials and tamper with VM lists due to disabled SSL verification, granting administrative access.

- **Severity:** High 7.1 (`CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:H/SA:H`)
- **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:** 4 Jun 2026
- **Updated:** 4 Jun 2026
- **Also known as:** GHSA-cggw-g858-xx4w

## What is CVE-2026-41859?

CVE-2026-41859 is a high-severity vulnerability in Cloud Foundry Foundation BOSH, published on 4 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A network man-in-the-middle between nats-sync and the BOSH director can steal the director credentials (Basic auth header or UAA client secret) and can tamper with the VM list that is written into the NATS authorization file. Stolen credentials grant administrative director access. UsersSync#bosh_api_response_body builds a Net::HTTP client with verify_mode = OpenSSL::SSL::VERIFY_NONE for every director call (/info, /deployments, /deployments/<name>/vms).

Affected versions:
- BOSH: all versions prior to v282.1.9 (inclusive); fixed in v282.1.9 or later

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2026-41859?


## How do I fix CVE-2026-41859?

No fix has been published for CVE-2026-41859 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-41859 being exploited?

There is no known exploitation of CVE-2026-41859 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41859 and fix it if it is affected.

What it is: CVE-2026-41859 is a high-severity vulnerability in Cloud Foundry Foundation BOSH, published on 4 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-41859 in the wild and no public exploit code.

Affected product: Cloud Foundry Foundation BOSH. 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-2026-41859/ (Markdown: https://insights.sbomify.com/CVE-2026-41859/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41859
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41859
- OSV: https://osv.dev/vulnerability/CVE-2026-41859

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41859/
Summaries are generated and may contain mistakes; the official description above is the record.