CVE-2025-34226

Description

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.

Weakness Type (CWE)

CWE-20 Improper Input Validation

CWE-664 CWE-664

References

Other References

https://autonomylogic.com/ https://github.com/thiagoralves/OpenPLC_v3/pull/297/commits/095ee09623dd229b64ad3a1db38a901a3772f6fc https://openplc.discussion.community/post/persistant-dos-affecting-openplc-runtime-13722844 https://www.vulncheck.com/advisories/openplc-runtime-v3-persistent-denial-of-service https://openplc.discussion.community/post/persistant-dos-affecting-openplc-runtime-13722844

Frequently Asked Questions

What is CVE-2025-34226? +

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.

How do I check if I'm vulnerable to CVE-2025-34226? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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