A HIGH-severity vulnerability identified as CVE-2026-9563 has been published on July 2, 2026 with a CVSS base score of 7.5. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.
Vulnerability Details
CVE ID: CVE-2026-9563
Severity: HIGH
CVSS Score: 7.5
Published: July 2, 2026
Weakness (CWE): CWE-400
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | High |
Technical Description
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.
Potential Impact
If exploited, this high-severity vulnerability could allow an attacker to cause a denial of service. Organizations running affected software should treat this as a priority remediation item.
Recommended Action
No official patch is available yet. Until one is released:
- Monitor the official NVD page and vendor channels for patch announcements.
- Restrict access to the affected system or service where possible.
- Apply network-level mitigations such as firewall rules or WAF policies.
- Enable logging and alerting for anomalous activity related to this vulnerability.
- Review your incident response plan in case of active exploitation.
References
Related Security Advisories
- [HIGH] CVE-2026-42402 — CVSS 7.5 (May 1, 2026) — HIGH / CVSS 7.5
- [HIGH] CVE-2026-6022 — CVSS 7.5 (April 22, 2026) — HIGH / CVSS 7.5
- [HIGH] CVE-2026-10538 — CVSS 8.0 (July 1, 2026) — HIGH / CVSS 8.0
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