Security Exception in Checkstyle: Vulnerability in JavaLanguageParser
Summary
OSV-2026-6: Security exception in com.puppycrawl.tools.checkstyle.grammar.java.JavaLanguageParser.expr. Affects checkstyle versions >= ba4a81f9fd3b8e989b435f1f3d678e001fb58eeb. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
Checkstyle is a development tool used to help programmers write Java code that adheres to a coding standard. It automates the process of checking Java code for adherence to a set of coding rules. The tool is widely used in Java projects to maintain code quality and consistency. However, it has been identified that the JavaLanguageParser component can encounter a security exception, which may lead to unexpected behavior or crashes during code analysis.
Vulnerability Detail
The vulnerability originates from a security exception in the JavaLanguageParser's expression handling. Specifically, the crash occurs in the method 'expr' when processing certain inputs, potentially leading to application crashes or unintended behavior. The issue was reported in an OSS-Fuzz report, indicating that the vulnerability could be exploited under specific conditions, affecting the stability and reliability of applications using Checkstyle for code analysis.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
As a temporary workaround, you can avoid using the specific features of Checkstyle that invoke the JavaLanguageParser until the package is updated. This may involve modifying your code analysis configurations to exclude certain checks that rely on this parser.
Conclusion
In summary, a security exception vulnerability has been identified in the Checkstyle package, specifically within the JavaLanguageParser component. It is crucial for developers using Checkstyle to update to the latest version to mitigate potential risks. Additionally, temporary workarounds are available for those unable to update immediately.
See every vulnerability recorded for checkstyle →
FAQ
The security exception occurs during the parsing of Java expressions, which can lead to application crashes.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. By simply uploading your manifest file like package-lock.json, you can check for vulnerabilities in real-time.
Yes, updating to the latest version of Checkstyle will resolve this vulnerability.
You can implement a workaround by avoiding the use of features that invoke the JavaLanguageParser until an update is applied.
Detailed information can be found in the OSS-Fuzz report linked in the vulnerability details.
References
Related vulnerabilities
Recent vulnerabilities recorded for checkstyle.
