CVE-2026-1876: Improper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-

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HIGH 7.5REMOTEMITIGATE

CVE-2026-1876 is a high-severity flaw (CVSS 7.5) affecting 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.

Improper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP all versions 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.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

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-404
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 08:16 UTCPublished CVE record published
2026-06-17 10:16 UTCUpdated Record last modified

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

Affected: all versions

Fixed in: no fixed release known

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-2026-1876?

melsec iq-f fx5-enet\/ip firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-1876 being exploited?

CVE-2026-1876 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-2026-1876 affect?

CVE-2026-1876 affects melsec iq-f fx5-enet\/ip firmware. Severity is high (CVSS 7.5). Improper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP all versions allows a remote attacker to cause a denial-of-service (DoS) condition on the prod

How urgent is CVE-2026-1876?

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

Software pages

Mitsubishi Electric vulnerabilities

Related CVEs

CVE-2026-1874 HIGH 7.5 UPGRADE UPGRADE Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Seri

References

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