# MariaDB has cleartext password disclosure to a MITM on the initial-handshake

Advisory record · `GHSA-g9jj-cgmh-9f38`

- **Identifiers:** `GHSA-g9jj-cgmh-9f38` · `CVE-2026-55856`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-522](https://cwe.mitre.org/data/definitions/522.html)
- **Tags:** [Hard-coded credentials](https://agentprime.io/advisories/tag/hard-coded-credentials.md)
- **Published:** 28 Aug 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Aug 2026, 22:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.mariadb.jdbc:mariadb-java-client` (Maven): affected `<2.7.14 || >=3.0.0, <3.3.5 || >=3.4.0, <3.4.3 || >=3.5.0, <3.5.9`; fixed in `2.7.14`, `3.3.5`, `3.4.3`, `3.5.9`

## 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 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0044, the 38th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-g9jj-cgmh-9f38)

## Sources

- [GitHub Advisory Database: GHSA-g9jj-cgmh-9f38](https://github.com/advisories/GHSA-g9jj-cgmh-9f38)
- [OSV: GHSA-g9jj-cgmh-9f38](https://osv.dev/vulnerability/GHSA-g9jj-cgmh-9f38)
- <https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38>
- <https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056>
- <https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a>
- <https://hackerone.com/reports/3777370>
- <https://github.com/mariadb-corporation/mariadb-connector-j>
- <https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3>
- <https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9>
- <https://jira.mariadb.org/browse/CONJ-1325>

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-g9jj-cgmh-9f38>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-g9jj-cgmh-9f38/>. Everything for agents: <https://agentprime.io/llms.txt>.