CVE-2026-9563

In Eclipse Parsson published Maven Central artifacts before version 1.1.8, the JSON parser 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. Eclipse Parsson 1.1.8 introduces a configurable maximum parsing limit with a default limit of 15 million parser-consumed characters.

• Published Jul 2, 2026
• CVSS 7.5 high
• 0.6% chance of exploitation in the next 30 days (EPSS)
• A fix is available

CVE-2026-9563 at the National Vulnerability Database