CVE-2026-41009 Local Blobstore may allow arbitrary reads/deletes
Attackers can read or delete arbitrary files via path traversal in the local blobstore when processing agent responses.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-41009?
CVE-2026-41009 is a medium-severity path traversal vulnerability in Cloud Foundry Foundation BOSH Director, published on 27 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
When the director sends a long-running request (e.g. compile_package), the agent's reply JSON is consumed by AgentClient. inject_compile_log (line 332-339) reads response['value']['result']['compile_log_id'] and format_exception (line 318-325) reads exception['blobstore_id']; both pass the agent-supplied string unmodified to download_and_delete_blob(blob_id) (line 344-349), which calls @resource_manager.get_resource(blob_id) and, in an ensure block, @resource_manager.delete_resource(blob_id). Api::ResourceManager forwards the id straight to blobstore.get(id) / blobstore.delete(id). When the director is configured with the local blobstore provider, Blobstore::LocalClient#object_file_path(oid) is File.join(@blobstore_path, oid) (local_client.rb:54-56) with no normalisation, so oid = "../../jobs/director/config/director.yml" resolves outside the blobstore root.
Affected versions: BOSH Director: All versions prior to v282.1.12
Weakness: CWE-22
Which versions are affected by CVE-2026-41009?
It affects 1 product.
Products include Cloud Foundry Bosh.
How do I fix CVE-2026-41009?
No fix has been published for CVE-2026-41009 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-41009 being exploited?
There is no known exploitation of CVE-2026-41009 in the wild and no public exploit code.
Other vulnerabilities in Cloud Foundry Foundation BOSH Director
Sources
Also known as GHSA-gq7j-4834-ccgp.