# CVE-2026-9158: Use after free in Eclipse 4diac

> A use-after-free vulnerability in Eclipse 4diac FORTE allows attackers to execute arbitrary code or cause denial of service via crafted DELETE commands.

- **Severity:** Medium 5.2 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/S:P/RE:L/U:Green`)
- **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:** 18 Jun 2026
- **Updated:** 18 Jun 2026
- **Also known as:** GHSA-j8fr-ghg4-6wpr

## What is CVE-2026-9158?

CVE-2026-9158 is a medium-severity use after free vulnerability in Eclipse 4diac, published on 18 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In Eclipse 4diac FORTE versions 3.0.0 to 3.1.0, a specially crafted DELETE connection command to the management interface can lead to a dangling pointer. This allows subsequent commands to access freed memory (use-after-free).

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2026-9158?

It affects 1 product.


Products: Eclipse 4diac Forte.

## How do I fix CVE-2026-9158?

No fix has been published for CVE-2026-9158 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9158 being exploited?

There is no known exploitation of CVE-2026-9158 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9158 and fix it if it is affected.

What it is: CVE-2026-9158 is a medium-severity use after free vulnerability in Eclipse 4diac, published on 18 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-2026-9158 in the wild and no public exploit code.

Affected product: Eclipse 4diac. 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-2026-9158/ (Markdown: https://insights.sbomify.com/CVE-2026-9158/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9158
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9158
- OSV: https://osv.dev/vulnerability/CVE-2026-9158

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9158/
Summaries are generated and may contain mistakes; the official description above is the record.