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.

CVSS 4.0

7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

EPSS

0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-25)

CWEs

CWE-20, CWE-664

Published

2025-10-03

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

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

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