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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Sources
Also known as GHSA-cggw-g858-xx4w.