# CVE-2026-119278: MariaDB Connector/J: Rogue server can crash the client during caching_sha2_password authentication


- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 29 Oct 2026
- **Updated:** 29 Oct 2026

## What is CVE-2026-119278?

CVE-2026-119278 is a medium-severity vulnerability in mariadb-corporation mariadb-connector-j, published on 29 Oct 2026. 

### Official description

MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. From 3.0.0 until 3.3.7 and 3.4.5, during caching_sha2_password authentication, the authentication-more-data response was treated as a length-encoded byte array, memory was allocated from the server-declared length, and authResult[0] was accessed without ensuring a byte existed. A malicious or compromised server, or a machine-in-the-middle attacker, could declare a very large length or send an empty response before any password was transmitted. The malformed packet could cause excessive allocation or an unchecked ArrayIndexOutOfBoundsException escaping from DriverManager.getConnection(). This issue is fixed in versions 3.3.7 and 3.4.5.

Weakness: CWE-789 (Memory Allocation with Excessive Size Value), CWE-129 (Improper Validation of Array Index)

## Which versions are affected by CVE-2026-119278?


## How do I fix CVE-2026-119278?

No fix has been published for CVE-2026-119278 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-119278 being exploited?

There is no known exploitation of CVE-2026-119278 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-119278 and fix it if it is affected.

What it is: CVE-2026-119278 is a medium-severity vulnerability in mariadb-corporation mariadb-connector-j, published on 29 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-119278 in the wild and no public exploit code.

Affected product: mariadb-corporation mariadb-connector-j. 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-2026-119278/ (Markdown: https://insights.sbomify.com/CVE-2026-119278/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-119278
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-119278
- OSV: https://osv.dev/vulnerability/CVE-2026-119278

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-119278/
Summaries are generated and may contain mistakes; the official description above is the record.