SUSE alert openSUSE-SU-2026:21473-1 (apptainer)

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null@suse.de
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security-announce@lists.opensuse.org
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openSUSE-SU-2026:21473-1: important: Security update for apptainer
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Thu, 30 Jul 2026 17:53:11 +0200
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<20260730155311.204C6FDFA@maintenance.suse.de>
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Article
openSUSE security update: security update for apptainer
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21473-1
Rating: important
References:

  * bsc#1266656
  * bsc#1272115



Cross-References:

  * CVE-2026-39821
  * CVE-2026-56852



CVSS scores:

  * CVE-2026-39821 ( SUSE ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-39821 ( SUSE ): 9.1 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-56852 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56852 ( SUSE ): 6 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected Products:

         openSUSE Leap 16.0

-------------------------------------------------------------

An update that solves 2 vulnerabilities and has 2 bug fixes can now be installed.

Description:

This update for apptainer fixes the following issues:

Changes in apptainer:

- Update to version 1.5.3:
  * If the ptrace() system call does not work while building an image as
    an unprivileged user, skip using PRoot to preserve file ownership and
    print an INFO message.
  * Bind getopt from the host when using fakeroot command mode, to make
    the fakeroot command work with base containers which no longer contain
    getopt by default.
  * Update fixes CVE-2026-56852 (GO-2026-5970) (bsc#1272115)
    golang.org/x/text/unicode/norm:
    A norm.Iter can enter an infinite loop when handling input
    containing invalid UTF-8 bytes.

- Update to version 1.5.2:
  * Extended the mksquashfs segmentation fault workaround for cases
    where mksquashfs uses many processor cores.

- Update the golang.org/x/net dependency to version v0.57.0
  to fix CVE-2026-39821 for good (bsc#1266656).
  The fix in v0.55.0 only applied to Unicode versions >=16.0.0
  which aren't yet available on any Golang versions released.


Patch instructions:

   To install this openSUSE security update use the suse recommended installation methods
   like YaST online_update or "zypper patch".
   Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

   zypper in -t patch
openSUSE-Leap-16.0-openSUSE_Backports_SLE-16.0__patchinfo.20260727081627270283.93181000773252=1

Package List:

- openSUSE Leap 16.0:

  apptainer-1.5.3-bp160.1.1
  apptainer-leap-1.5.3-bp160.1.1

References:

  * https://www.suse.com/security/cve/CVE-2026-39821.html
  * https://www.suse.com/security/cve/CVE-2026-56852.html