# CVE-2026-1875: Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series EtherNet/IP module

> Remote attackers can cause denial of service on Mitsubishi MELSEC iQ-F EtherNet/IP modules by flooding UDP packets, requiring a system reset to recover.

- **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:** 3 Mar 2026
- **Updated:** 24 Apr 2026
- **Also known as:** GHSA-x6r6-4hcc-5hhw

## What is CVE-2026-1875?

CVE-2026-1875 is a high-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP, published on 3 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP versions 1.000 and prior allows a remote attacker to cause a denial-of-service (DoS) condition on the products by continuously sending UDP packets to the products. A system reset of the product is required for recovery.

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2026-1875?

It affects 1 product.


Products: Mitsubishielectric Melsec Iq-F Fx5-Eip Firmware.

## How do I fix CVE-2026-1875?

No fix has been published for CVE-2026-1875 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1875 being exploited?

There is no known exploitation of CVE-2026-1875 in the wild and no public exploit code.

## Other vulnerabilities in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP

- [CVE-2026-1874](https://insights.sbomify.com/CVE-2026-1874/): Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series EtherNet/IP module and Ethernet module (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1875 and fix it if it is affected.

What it is: CVE-2026-1875 is a high-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP, published on 3 Mar 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-2026-1875 in the wild and no public exploit code.

Affected product: Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP. 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-2026-1875/ (Markdown: https://insights.sbomify.com/CVE-2026-1875/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1875
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1875
- OSV: https://osv.dev/vulnerability/CVE-2026-1875

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-1875/
Summaries are generated and may contain mistakes; the official description above is the record.