Security Bulletin
Summary
IBM SDK Java Technology Edition and IBM Runtime Environment Java used by IBM i to support the building and running of Java applications are vulnerable to denial-of-service [CVE-2026-21945] and bypassing security controls to read and change data [CVE-2026-21932, CVE-2026-21933, CVE-2026-21925] as described in the vulnerability details section.
Vulnerability Details
CVEID: CVE-2026-21945
DESCRIPTION: Java SE is vulnerable to a denial of service, caused by an easily exploitable vulnerability issue that allows an remote attacker to cause a hang or repeatable crash of the application.
CWE: CWE-400: Uncontrolled Resource Consumption
CVSS Source: secalert_us@oracle.com
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)
CVEID: CVE-2026-21932
DESCRIPTION: Java SE could allow a remote attacker to bypass security controls and create, delete, or modify critical data or all accessible data, caused by an easily exploitable vulnerability.
CVSS Source: secalert_us@oracle.com
CVSS Base score: 7.4
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N)
CVEID: CVE-2026-21933
DESCRIPTION: Java SE could allow a remote attacker to bypass security controls and perform unauthorized update, insert, delete, or read operations on accessible data, caused by an easily exploitable vulnerability.
CVSS Source: secalert_us@oracle.com
CVSS Base score: 6.1
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
CVEID: CVE-2026-21925
DESCRIPTION: Java SE could allow a remote unauthenticated attacker to bypass security controls and perform unauthorized update, insert, delete, or read operations on accessible data, caused by an difficult to exploit vulnerability.
CVSS Source: secalert_us@oracle.com
CVSS Base score: 4.8
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)
Affected Products and Versions
| Affected Product(s) | Affected Product Version(s) | Affected Product Feature(s) or License Program Product(s) |
| IBM i | 7.6 | 5770-JV1 |
| IBM i | 7.5 | 5770-JV1 |
| IBM i | 7.4 | 5770-JV1 |
| IBM i | 7.3 | 5770-JV1 |
Remediation/Fixes
IBM recommends installing the 5770-JV1 PTF Group to receive all the latest PTF(s) which includes all PTFs in the above table.
| IBM i Release | 5770-JV1 PTF Group Number & Level | PTF Download Link(s) |
| 7.6 | SF99965 Level 5 | https://www.ibm.com/mysupport/s/fix-information?legacy=SF99965 |
| 7.5 | SF99955 Level 20 | https://www.ibm.com/mysupport/s/fix-information?legacy=SF99955 |
| 7.4 | SF99665 Level 32 | https://www.ibm.com/mysupport/s/fix-information?legacy=SF99665 |
| 7.3 | SF99725 Level 41 | https://www.ibm.com/mysupport/s/fix-information?legacy=SF99725 |
IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
10 Apr 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:
13 April 2026
Initial Publish date:
10 April 2026
UID
ibm17269155