CVE-2013-4660
Deserialization Code Execution in js-yaml
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.
Exploit likelihood
What each source reports
NVD Score used
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.
- Record
CVE-2013-4660- CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.
- Record
CVE-2013-4660- Updated
- 2026-11-02
EUVDEUVD-2017-0338 No score
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.
- Record
EUVD-2017-0338- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xxvw-45rp-3mj2 No score
Deserialization Code Execution in js-yaml
Versions 2.0.4 and earlier of js-yaml are affected by a code execution vulnerability in the YAML deserializer.
Proof of Concept
const yaml = require('js-yaml');
const x = `test: !!js/function >
function f() {
console.log(1);
}();`
yaml.load(x);
Recommendation
Update js-yaml to version 2.0.5 or later, and ensure that all instances where the .load() method is called are updated to use .safeLoad() instead.
- Record
GHSA-xxvw-45rp-3mj2- Weakness
- CWE-20
- Updated
- 2026-11-02
OSVGHSA-xxvw-45rp-3mj2 No score
Deserialization Code Execution in js-yaml
Versions 2.0.4 and earlier of js-yaml are affected by a code execution vulnerability in the YAML deserializer.
Proof of Concept
const yaml = require('js-yaml');
const x = `test: !!js/function >
function f() {
console.log(1);
}();`
yaml.load(x);
Recommendation
Update js-yaml to version 2.0.5 or later, and ensure that all instances where the .load() method is called are updated to use .safeLoad() instead.
- Record
GHSA-xxvw-45rp-3mj2- Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
js-yamlnpm |
before 2.0.5 | 2.0.5 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Nodejs - 'js-yaml load()' Code Exec (Metasploit) | 2013-09-30 |
| Metasploit | Nodejs js-yaml load() Code Execution | 2013-06-28 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, Metasploit, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2013-4660 is a medium vulnerability (CVSS 6.8) in Nodeca Js-yaml, published June 28, 2013. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 17.3%, the 97th percentile. Fixed in js-yaml 2.0.5.