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CVE-2025-34226

HighPublished

OpenPLC Runtime v3 Persistent DoS

Published: Oct 3, 2025
Updated: Aug 14, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 10, 2026

Primary CVSS

7.1/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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:X

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 49.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

OpenPLC Runtime v3 contains an input validation flaw in the /upload-program-action endpoint: the epoch_time field supplied during program uploads is not validated and can be crafted to induce corruption of the programs database. After a successful malformed upload the runtime continues to operate until a restart; on restart the runtime can fail to start because of corrupted database entries, resulting in persistent denial of service requiring complete rebase of the product to recover. This vulnerability was remediated by commit 095ee09.

Sources

CVE-2025-34226PoC
OpenPLC Runtime suffers from a persistent denial of service (DoS) vulnerability in the /upload-program-action endpoint.

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