Security Bulletin
Summary
The nghttp2 library is used by Power Hardware Management Console (HMC). HMC has addressed the applicable CVE.
Vulnerability Details
CVEID: CVE-2026-27135
DESCRIPTION: nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API `nghttp2_session_terminate_session` or `nghttp2_session_terminate_session2` is called by the application. They might be called internally by the library when it detects the situation that is subject to connection error. Due to the missing internal state validation, the library keeps reading the rest of the data after one of those APIs is called. Then receiving a malformed frame that causes FRAME_SIZE_ERROR causes assertion failure. nghttp2 v1.68.1 adds missing state validation to avoid assertion failure. No known workarounds are available.
CWE: CWE-617: Reachable Assertion
CVSS Source: security-advisories@github.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)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| HMC V10.3.1050.0 | V10.3.1050.0 - V10.3.1064.0 |
| HMC V11.1.1110.0 | V11.1.1110.0 - V11.1.1112.0 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now. The following fixes are available on IBM Fix Central at:
V10R3
V11R1
|
Product
|
Affected Version(s)
|
VRMF
|
APAR
|
Remediation/Fix
|
|
Power HMC
|
V10.3.1050.0 - V10.3.1064.0
|
V10.3.1064.1 x86
|
MB04527 |
MF71762 |
|
Power HMC
|
V10.3.1050.0 - V10.3.1064.0
|
V10.3.1064.1 ppc
|
MB04528 |
MF71763 |
|
Power HMC
|
V11.1.1110.0 - V11.1.1112.0
|
V11.1.1112.1 x86
|
MB04529 |
MF71764 |
|
Power HMC
|
V11.1.1110.0 - V11.1.1112.0
|
V11.1.1112.1 ppc
| MB04530 |
MF71765 |
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
01 Jul 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:
01 July 2026
Initial Publish date:
01 July 2026
UID
ibm17278708