[QSA-1031262]
Security Update Bundle

Qlustar Security Advisory 1031262

October 31st, 2026

Summary:

A Qlustar security update bundle is a cumulative update of packages that are taken from upstream Debian/Ubuntu without modification. Only packages that are used in a typical HPC/Storage cluster installation are mentioned in Qlustar Security Advisories. Other non-HPC related updates also enter the Qlustar repository, but their functionality is not separately verified by the Qlustar team. To track these updates subscribe to the general security mailing lists of Debian/Ubuntu and/or AlmaLinux.

Package(s)       : see upstream description of individual package
Qlustar releases : 13, 14
Affected versions: All versions prior to this update
Vulnerability    : see upstream description of individual package
Problem type     : see upstream description of individual package
Qlustar-specific : no
CVE Id(s)        : see upstream description of individual package

This update includes several security related package updates from Debian/Ubuntu and AlmaLinux. The following list provides references to the upstream security report of the corresponding packages. You can view the original upstream advisory by clicking on the corresponding title.

Relevant to Qlustar 13 and/or 14 – Ubuntu

If an advisory applies only to Qlustar 13 or 14, it is noted in its description.

Brotli vulnerability

It was discovered that Brotli incorrectly handled certain compressed streams. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-111497)

zlib vulnerability

Ali Firas discovered that zlib incorrectly handled certain non-blocking write operations. An attacker could possibly use this issue to trigger a heap buffer overflow, resulting in a denial of service or arbitrary code execution. This issue only affected Qlustar 14. (CVE-2026-85091)

AlmaLinux 8.10 security updates

Please check the AlmaLinux Errata site for details about AlmaLinux 8 updates that entered this release (everything from October 21st until October 30th).

Update instructions:

The problem can be corrected by updating your system to the following or more recent package versions:

For Qlustar 14

qlustar-module-core-noble-amd64-14.1       14.1.15-b589f1661
qlustar-module-core-centos8-amd64-14.1     14.1.15-b589f1661

For Qlustar 13

qlustar-module-core-jammy-amd64-13.4       13.4.14-b588f1660

Special Update instructions:

In addition to the steps described in the general Qlustar Update Instructions these updates require the following:

• Spack migration With the release of the HPC Core Stack 02/26, spack was also updated to version 1.1.1. If you haven’t yet migrated your spack database to version 8, login on a cluster node as a user with Spack admin rights (usually user softadm or anybody in the group softadm) and execute

  # spack reindex
  

  Note that after this, older Spack versions will no longer be able to read the database. However, a backup is created in case a revert is needed.

• Please note that we no longer provide 13.x AlmaLinux 8 modules for Qlustar 13. If you want to use AlmaLinux 8 under Qlustar 13, please switch to the 14.x image modules and create a corresponding chroot for it.