Resource exhaustion in parsson - CVE-2026-9563

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to Eclipse Parsson did not enforce a default maximum on the number of characters consumed while parsing a single JSON document. Applications that parse attacker- controlled JSON can be forced to consume excessive CPU and memory by processing very large documents, including large arrays, objects, strings, numbers, whitespace, or nested structures, resulting in a denial of service. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Affected software

How to mitigate CVE-2026-9563

External References

• https://github.com/eclipse-ee4j/parsson/commit/134e8d101aa74c8b9302d0cb62f6ccb4912a9d0c
• https://github.com/eclipse-ee4j/parsson/pull/169
• https://github.com/eclipse-ee4j/parsson/tree/1.1.8
• https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/444
• https://repo.maven.apache.org/maven2/org/eclipse/parsson/parsson/1.1.8/

Related Security Bulletins

• Resource exhaustion in Eclipse Parsson
• Multiple vulnerabilities in IBM SPSS Collaboration and Deployment Services
• Resource exhaustion in IBM Cloud Pak for Applications
• Resource exhaustion in IBM Enterprise Application Runtimes
• Resource exhaustion in IBM WebSphere Hybrid Edition
• IBM WebSphere Application Server - Liberty update for Eclipse Parsson
• Multiple vulnerabilities in IBM SPSS Analytic Server
• Resource exhaustion in IBM webMethods API ControlPlane (on-prem)