Security Bulletin
Summary
IBM i is vulnerable to using a less trusted source due to DisableForwarding taking precendence over PermitTunnel [CVE-2026-59999] and not always honoring the minimum authentication delay [CVE-2026-60001] in OpenSSH as described in the vulnerability details section.
Vulnerability Details
CVEID: CVE-2026-59999
DESCRIPTION: In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
CWE: CWE-348: Use of Less Trusted Source
CVSS Source: NVD
CVSS Base score: 7.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
CVEID: CVE-2026-60001
DESCRIPTION: sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.
CWE: CWE-770: Allocation of Resources Without Limits or Throttling
CVSS Source: cve@mitre.org
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L)
Affected Products and Versions
| Affected Product(s) | Affected Product Version(s) | Affected Product Feature(s) or License Program Product(s) |
| IBM i | 7.6 | 5733-SC1 |
| IBM i | 7.5 | 5733-SC1 |
| IBM i | 7.4 | 5733-SC1 |
| IBM i | 7.3 | 5733-SC1 |
Remediation/Fixes
| IBM i Release | 5733-SC1 PTF Number(s) | PTF Download Link(s) |
| 7.6 | SJ11038 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11038 |
| 7.5 | SJ11039 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11039 |
| 7.4 | SJ11053 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11053 |
| 7.3 | SJ11053 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11053 |
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 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:
10 August 2026
Initial Publish date:
10 August 2026
UID
ibm17283142