# CVE-2026-89025: Hirschmann HiOS Switch Platform DoS via Malformed HTTP Request

> Remote unauthenticated attackers can cause a denial of service by sending malformed HTTP requests to the web server, requiring an upgrade to patched firmware versions.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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:** 15 Sep 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-f972-wg3c-28j6

## What is CVE-2026-89025?

CVE-2026-89025 is a high-severity denial of service vulnerability in Belden Hirschmann HiOS Switch Platform, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Hirschmann HiOS Switch Platform devices contain a denial-of-service vulnerability in the integrated web server due to missing validation of HTTP(S) content. A remote unauthenticated attacker can send a specially crafted HTTP(S) request to a specific endpoint that is processed incorrectly, causing the device to perform an unintended reboot and resulting in a temporary denial-of-service condition. This vulnerability has been addressed in versions 07.1.12, 08.7.10, 09.0.13, 09.3.03, 10.3.08, and 10.5.00.

Weakness: CWE-755 (Improper Handling of Exceptional Conditions)

## Which versions are affected by CVE-2026-89025?


## How do I fix CVE-2026-89025?

No fix has been published for CVE-2026-89025 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89025 being exploited?

There is no known exploitation of CVE-2026-89025 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89025 and fix it if it is affected.

What it is: CVE-2026-89025 is a high-severity denial of service vulnerability in Belden Hirschmann HiOS Switch Platform, published on 15 Sep 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-2026-89025 in the wild and no public exploit code.

Affected product: Belden Hirschmann HiOS Switch Platform. 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-2026-89025/ (Markdown: https://insights.sbomify.com/CVE-2026-89025/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89025
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89025
- OSV: https://osv.dev/vulnerability/CVE-2026-89025

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89025/
Summaries are generated and may contain mistakes; the official description above is the record.