# CVE-2025-34226: OpenPLC Runtime v3 Persistent DoS

Status: published. Published: 2025-10-03. Updated: 2026-11-08.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/thiagoralves/OpenPLC_v3/pull/297/commits/095ee09623dd229b64ad3a1db38a901a3772f6fc

## Affected products and versions

- Autonomy Logic / OpenPLC Runtime: ≥ 3.0; < 095ee09623dd229b64ad3a1db38a901a3772f6fc (affected, git). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.1 (high); 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; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.68% as of 2026-11-08; percentile 52.57%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-664, CWE-20

## Exploit evidence

- exploit: https://openplc.discussion.community/post/persistant-dos-affecting-openplc-runtime-13722844 (ADP: CISA-ADP)

## References

- https://autonomylogic.com/ (CNA: VulnCheck; product)

- https://openplc.discussion.community/post/persistant-dos-affecting-openplc-runtime-13722844 (CNA: VulnCheck; issue-tracking)

- https://github.com/thiagoralves/OpenPLC_v3/pull/297/commits/095ee09623dd229b64ad3a1db38a901a3772f6fc (CNA: VulnCheck; issue-tracking, patch)

- https://www.vulncheck.com/advisories/openplc-runtime-v3-persistent-denial-of-service (CNA: VulnCheck; third-party-advisory)

- https://openplc.discussion.community/post/persistant-dos-affecting-openplc-runtime-13722844 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2025-34226; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-34226; retrieved 2026-11-08; source updated Not reported

Revision: 663dd94906304943e33a63b3af34ed2c3183cd973feae1aa46c86d312752313b

Canonical: https://y2.dev/cve/CVE-2025-34226

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