CVE-2026-1876
Mitsubishielectric Melsec Iq-F Fx5-Enet\/Ip Firmware
Raw vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XSummary
CVE-2026-1876 is a high-severity Improper Resource Shutdown or Release (CWE-404) vulnerability in Mitsubishielectric Melsec Iq-F Fx5-Enet\/Ip Firmware. Its CVSS base score is 8.7 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 35th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-8 (Security and Privacy Engineering Principles) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-1876 is an Improper Resource Shutdown or Release vulnerability classified under CWE-404, affecting all versions of the Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module. Published on 2026-03-03, this flaw enables a remote attacker to induce a denial-of-service (DoS) condition on the affected products by continuously sending UDP packets, with the CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflecting high availability impact without confidentiality or integrity disruption.
Any remote attacker with network access to the device can exploit this vulnerability, requiring low complexity, no privileges, and no user interaction. Exploitation disrupts device availability through resource exhaustion, rendering the module unresponsive until a manual system reset is performed for recovery.
Advisories providing mitigation guidance and patch information include JVN VU#93286687 at https://jvn.jp/vu/JVNVU93286687/, CISA ICSA-26-62-01 at https://www.cisa.gov/news-events/ics-advisories/icsa-26-62-01, and Mitsubishi Electric PSIRT document 2025-021 at https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9282
Vulnerability Data
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.…
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A system reset of the product is required for recovery.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and evaluation can discover missing or incorrect resource releases after code is written.
Engineering principles can require explicit resource acquisition/release patterns that stop improper shutdown from being introduced.
Priority-based resource allocation limits the blast radius when released resources are not returned to the pool.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly include coding standards for correct resource allocation and release.
Runtime monitoring can detect resource exhaustion caused by improper shutdown or release.
Lifecycle management of assets can encompass proper resource release at end-of-life or shutdown.
Capacity management helps surface leaks from unreleased resources but does not prevent the coding flaw.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Including restart, recovery and media-handling instructions reduces the likelihood that resources or sensitive data will be left in an exposed or improperly released state after a failure.