# CVE-2026-41861: Arbitrary Root File Write via Path Traversal in BOSH agent

> An attacker can write arbitrary root-owned files and create directories via path traversal in the BOSH agent, potentially leading to code execution or privilege escalation.

- **Severity:** Medium 4.2 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Aug 2026
- **Updated:** 7 Aug 2026
- **Also known as:** GHSA-hr6c-84vf-jf53

## What is CVE-2026-41861?

CVE-2026-41861 is a medium-severity path traversal vulnerability in CloudFoundry Foundation BOSH, published on 6 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Path Traversal in BOSH-Ecosystem / BOSH allows an IaaS-metadata attacker to make the agent write a root-owned file with partially attacker-controlled body to any path ending in .network, and create any missing parent directories with mode 0777 via network Alias on Ubuntu.

Affected versions: BOSH agent < v2.847.0 (jammy <= v1.1202, or noble <= v1.364). Lower bound unspecified in advisory ("All bosh agent versions").

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-41861?


## How do I fix CVE-2026-41861?

No fix has been published for CVE-2026-41861 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-41861 being exploited?

There is no known exploitation of CVE-2026-41861 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41861 and fix it if it is affected.

What it is: CVE-2026-41861 is a medium-severity path traversal vulnerability in CloudFoundry Foundation BOSH, published on 6 Aug 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-2026-41861 in the wild and no public exploit code.

Affected product: CloudFoundry 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-2026-41861/ (Markdown: https://insights.sbomify.com/CVE-2026-41861/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41861
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41861
- OSV: https://osv.dev/vulnerability/CVE-2026-41861

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-41861/
Summaries are generated and may contain mistakes; the official description above is the record.