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Security Bulletin: Eclipse Parsson JSON Parser Denial of Service via Unbounded Input

Security Bulletin


Summary

Eclipse Parsson versions before 1.1.8 are vulnerable to uncontrolled resource consumption (CWE-400, CVSS 7.5, High). The JSON parser imposed no default limit on the number of characters consumed per document, allowing an attacker to supply a crafted oversized JSON payload — including large arrays, objects, strings, numbers, or deeply nested structures — to exhaust CPU and memory and cause a denial of service. Version 1.1.8 introduces a configurable parsing limit defaulting to 15 million characters. Upgrade to Eclipse Parsson 1.1.8 or later to remediate.

Vulnerability Details

CVEID:   CVE-2026-9563
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.
CWE:   CWE-400: Uncontrolled Resource Consumption
CVSS Source:   emo@eclipse.org
CVSS Base score:   7.5
CVSS Vector:   (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Content Navigator26.0.0.0
IBM Content Navigator3.2.0.0

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now by upgrading.
Affected Product(s)Version(s)Remediation / Fix
IBM Content Navigator26.0.0.0Apply security fix 26.0.0-IF001
IBM Content Navigator3.2.0.0Apply security fix 3.2.0-IF007

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

Change History

07 Aug 2026: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
07 August 2026

Initial Publish date:
07 August 2026

UID

ibm17282864