Security Bulletin
Summary
This bulletin for IBM Semeru Runtime covers all applicable Java SE CVEs published by OpenJDK as part of their January 2026 Vulnerability Advisory, plus CVE-2026-1188. For more information please refer to OpenJDK's January 2026 Vulnerability Advisory and the CVE links below.
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)
CVEID: CVE-2026-1188
DESCRIPTION: In the Eclipse OMR port library component since release 0.2.0, an API function to return the textual names of all supported processor features was not accounting for the separator inserted between processor features. If the output buffer supplied to this function was incorrectly sized, failing to account for the separator when determining when a write to the buffer was safe could lead to a buffer overflow. This issue is fixed in Eclipse OMR version 0.8.0.
CWE: CWE-131: Incorrect Calculation of Buffer Size
CVSS Source: NVD
CVSS Base score: 9.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM Semeru Runtime | 8.0.302.0 - 8.0.472.0 |
| IBM Semeru Runtime | 11.0.12.0 - 11.0.29.0 |
| IBM Semeru Runtime | 17.0.0.0 - 17.0.17.0 |
| IBM Semeru Runtime | 21.0.0.0 - 21.0.9.0 |
| IBM Semeru Runtime | 25.0.0.0 - 25.0.1.0 |
Note: CVE-2026-21932 is applicable on Windows and Mac OS only.
For detailed information on which CVEs affect which releases, please refer to the IBM Semeru Security Vulnerabilities page.
Remediation/Fixes
IBM strongly encourages customers to update their systems promptly.
8.0.482.0
11.0.30.0
17.0.18.0
21.0.10.0
25.0.2.0
IBM Semeru Runtime releases can be downloaded from the GitHub repositories for Semeru 8, Semeru 11, Semeru 17, Semeru 21, and Semeru 25, and from the IBM Semeru Developer Center.
IBM customers requiring an update for an SDK shipped with an IBM product should contact IBM support, and/or refer to the appropriate product security bulletin.
APAR numbers are as follows:
IJ57130 (CVE-2026-21945)
IJ57132 (CVE-2026-21932)
IJ57134 (CVE-2026-21933)
IJ57136 (CVE-2026-21925)
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
24 Feb 2026:Updated CVE Details
02 Feb 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:
24 February 2026
Initial Publish date:
02 February 2026
UID
ibm17259431