CVE-2026-1874: Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Seri

Q: How do I fix CVE-2026-1874?

melsec iq-f fx5-eip firmware: upgrade to newer than 1.000; melsec iq-f fx5-enet\/ip firmware: upgrade to newer than 1.106. Exact commands for each OS are on this page.

Q: Is CVE-2026-1874 being exploited?

CVE-2026-1874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-1874 affect?

CVE-2026-1874 affects melsec iq-f fx5-eip firmware, melsec iq-f fx5-enet\/ip firmware. Severity is high (CVSS 7.5). Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP versions 1.106 and prior and Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP

Q: How urgent is CVE-2026-1874?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2026-1874 is a high-severity flaw (CVSS 7.5) affecting melsec iq-f fx5-eip firmware, melsec iq-f fx5-enet\/ip firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP versions 1.106 and prior and 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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-670
Published	2026-03-03
Last modified	2026-06-17

Publisher (CNA): Mitsubishi Electric Corporation · Vendor: mitsubishielectric

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-03 07:16 UTCPublished CVE record published
2026-06-17 10:16 UTCUpdated Record last modified

mitsubishielectric melsec iq-f fx5-eip firmware UPGRADE

Affected: <= 1.000

Fixed in: newer than 1.000

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mitsubishielectric melsec iq-f fx5-enet\/ip firmware UPGRADE

Affected: <= 1.106

Fixed in: newer than 1.106

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-1874?

melsec iq-f fx5-eip firmware: upgrade to newer than 1.000; melsec iq-f fx5-enet\/ip firmware: upgrade to newer than 1.106. Exact commands for each OS are on this page.

Is CVE-2026-1874 being exploited?

CVE-2026-1874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-1874 affect?

CVE-2026-1874 affects melsec iq-f fx5-eip firmware, melsec iq-f fx5-enet\/ip firmware. Severity is high (CVSS 7.5). Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP versions 1.106 and prior and Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP

How urgent is CVE-2026-1874?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Software pages

Mitsubishi Electric vulnerabilities

Related CVEs

CVE-2026-1875 HIGH 7.5 UPGRADE Improper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-

References

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