# H2O-3 is Vulnerable to Code Injection

Advisory record · `GHSA-qmcv-hh7c-3m56`

- **Identifiers:** `GHSA-qmcv-hh7c-3m56` · `CVE-2026-3960` · `PYSEC-2026-2180`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-94](https://cwe.mitre.org/data/definitions/94.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 23 Apr 2026
- **Updated:** 13 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 23 Apr 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `ai.h2o:h2o-core` (Maven): affected `<3.46.0.10`; fixed in `3.46.0.10`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Maven package ai.h2o:h2o-core versions before 3.46.0.10 are vulnerable. An unauthenticated remote attacker can reach the REST endpoint /99/ImportSQLTable and, by using a PostgreSQL JDBC URL to get around the parameter blacklist, execute arbitrary code on the server with the privileges of the H2O-3 process. Upgrade to version 3.46.0.10, which fixes the issue.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.9 Medium, CVSS 3.0: `CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0094, the 61st percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:19 UTC: First seen by agentprime
- 31 Oct 2026, 14:19 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qmcv-hh7c-3m56)

## Sources

- [GitHub Advisory Database: GHSA-qmcv-hh7c-3m56](https://github.com/advisories/GHSA-qmcv-hh7c-3m56)
- [OSV: GHSA-qmcv-hh7c-3m56](https://osv.dev/vulnerability/GHSA-qmcv-hh7c-3m56)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-3960>
- <https://github.com/h2oai/h2o-3/commit/b9ae2d3c5220db2dc53753357a783e590364d044>
- <https://github.com/h2oai/h2o-3>
- <https://huntr.com/bounties/6954fe04-b905-453f-8c53-205ac8377e0d>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-qmcv-hh7c-3m56>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-qmcv-hh7c-3m56/>. Everything for agents: <https://agentprime.io/llms.txt>.