CVE-2024-21509: Versions of the package mysql2 before 3.9.4 are vulnerable to Prototype Poisoning due to insecure results obje

Q: How do I fix CVE-2024-21509?

mysql2: upgrade to 3.9.4. Exact commands for each OS are on this page.

Q: Is CVE-2024-21509 being exploited?

CVE-2024-21509 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-21509 affect?

CVE-2024-21509 affects mysql2. Severity is medium (CVSS 6.5). 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.

Q: How urgent is CVE-2024-21509?

Priority 53/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

MEDIUM 6.5REMOTEWATCHLISTUPGRADE

CVE-2024-21509 is a medium-severity flaw (CVSS 6.5) affecting mysql2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-1321
Published	2024-04-10
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: sidorares

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-10 05:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

sidorares mysql2 UPGRADE

Affected: < 3.9.4

Fixed in: 3.9.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mysql2 || rpm -q mysql2 || mysql2 --version

2. UPGRADE to 3.9.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mysql2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mysql2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-21509?

mysql2: upgrade to 3.9.4. Exact commands for each OS are on this page.

Is CVE-2024-21509 being exploited?

CVE-2024-21509 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-21509 affect?

CVE-2024-21509 affects mysql2. Severity is medium (CVSS 6.5). 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.

How urgent is CVE-2024-21509?

Priority 53/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2024-21507 MEDIUM 6.5 UPGRADE Versions of the package mysql2 before 3.9.3 are vulnerable to Improper Input Validation through the keyFromFie

References

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