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

> Attackers can cause persistent denial of service in OpenPLC Runtime by uploading malformed program data that corrupts the database, preventing restarts.

- **Severity:** High 7.1 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Oct 2025
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-qjpv-g9fx-fc98

## What is CVE-2025-34226?

CVE-2025-34226 is a high-severity denial of service vulnerability in Autonomy Logic OpenPLC Runtime, published on 3 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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: CWE-664 (Improper Control of a Resource Through its Lifetime), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-34226?


## How do I fix CVE-2025-34226?

No fix has been published for CVE-2025-34226 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-34226 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34226 exists.

Public exploit code:

- OpenPLC Runtime suffers from a persistent denial of service (DoS) vulnerability in the /upload-program-action endpoint. (github_poc): https://github.com/Eyodav/CVE-2025-34226

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34226 and fix it if it is affected.

What it is: CVE-2025-34226 is a high-severity denial of service vulnerability in Autonomy Logic OpenPLC Runtime, published on 3 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34226 exists.

Affected product: Autonomy Logic OpenPLC Runtime. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-34226/ (Markdown: https://insights.sbomify.com/CVE-2025-34226/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34226
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34226
- OSV: https://osv.dev/vulnerability/CVE-2025-34226

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34226/
Summaries are generated and may contain mistakes; the official description above is the record.