# CVE-2026-89208: Memory corruption in Capital Embedded AR Classic 431-422

> Unauthenticated remote attackers can trigger out-of-bounds memory reads in Siemens building automation devices, potentially exposing sensitive data or causing service disruption.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-3f9v-63rg-527j

## What is CVE-2026-89208?

CVE-2026-89208 is a medium-severity memory corruption vulnerability in Siemens Capital Embedded AR Classic 431-422, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Desigo PXC00-E.D (All versions >= V2.3), Desigo PXC00-U (All versions >= V2.3), Desigo PXC001-E.D (All versions >= V2.3), Desigo PXC100-E.D (All versions >= V2.3), Desigo PXC12-E.D (All versions >= V2.3), Desigo PXC128-U (All versions >= V2.3), Desigo PXC200-E.D (All versions >= V2.3), Desigo PXC22-E.D (All versions >= V2.3), Desigo PXC22.1-E.D (All versions >= V2.3), Desigo PXC36.1-E.D (All versions >= V2.3), Desigo PXC50-E.D (All versions >= V2.3), Desigo PXC64-U (All versions >= V2.3), Desigo PXM20-E (All versions >= V2.3). The affected product does not properly validate input bounds before accessing packet data. This could allow an unauthenticated remote attacker to trigger memory reads outside the intended packet boundaries.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-89208?


## How do I fix CVE-2026-89208?

No fix has been published for CVE-2026-89208 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89208 being exploited?

There is no known exploitation of CVE-2026-89208 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89208 and fix it if it is affected.

What it is: CVE-2026-89208 is a medium-severity memory corruption vulnerability in Siemens Capital Embedded AR Classic 431-422, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-89208 in the wild and no public exploit code.

Affected product: Siemens Capital Embedded AR Classic 431-422. 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-2026-89208/ (Markdown: https://insights.sbomify.com/CVE-2026-89208/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89208
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89208
- OSV: https://osv.dev/vulnerability/CVE-2026-89208

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-89208/
Summaries are generated and may contain mistakes; the official description above is the record.