Security Digest · Vulnerability record
CVE-2024-21508: mysql2 Remote Code Execution (RCE) via the readCodeFor function
Versions of the package mysql2 before 3.9.4 are vulnerable to Remote Code Execution (RCE) via the readCodeFor function due to improper validation of the supportBigNumbers and bigNumberStrings values.
CVSS 9.8 Critical EPSS 2.6% · p85
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 2.6%, percentile 85: FIRST’s model estimates a 2.6% chance of exploitation activity in the next 30 days, higher than 85% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
mysql2(npm) < 3.9.4, fixed in 3.9.4. Check your lockfile, including transitive dependencies.
What it is
Versions of the package mysql2 before 3.9.4 are vulnerable to Remote Code Execution (RCE) via the readCodeFor function due to improper validation of the supportBigNumbers and bigNumberStrings values.
From the GitHub advisory
Versions of the package mysql2 before 3.9.4 are vulnerable to Remote Code Execution (RCE) via the readCodeFor function due to improper validation of the supportBigNumbers and bigNumberStrings values.
Weakness type: CWE-94.
Product: mysql2 (npm) · Assigned by: snyk · Published: 2024-04-11
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| npm | mysql2 | < 3.9.4 | 3.9.4 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| n/a | mysql2 | < 3.9.4 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| snyk | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 2.55% probability of exploitation activity in the next 30 days; percentile 85.
Timeline
- — CVE record published by snyk
- — GitHub-reviewed advisory GHSA-fpw7-j2hg-69v5 published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-fpw7-j2hg-69v5 github.com
- CVE.org record CVE-2024-21508 cve.org
- NVD entry CVE-2024-21508 nvd.nist.gov
Other references from the CVE record and advisory
- security.snyk.io security.snyk.io
- blog.slonser.info blog.slonser.info
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com