Home / mailings [USN-8779-1] Bubblewrap vulnerabilities
Posted on 17 September 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8779-1
September 17, 2026
bubblewrap vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in Bubblewrap.
Software Description:
- bubblewrap: Low-level unprivileged sandboxing tool used by Flatpak and similar projects
Details:
It was discovered that Bubblewrap incorrectly handled certain temporary
directories. A local attacker could possibly use this issue to cause a
denial of service or execute arbitrary code. This issue only affected
Ubuntu 18.04 LTS. (CVE-2019-12439)
It was discovered that Bubblewrap incorrectly handled certain symlinks
during sandbox setup. A local attacker could possibly use this issue to
create files outside of the sandbox. (CVE-2026-87766)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
bubblewrap 0.11.1-1ubuntu0.2
Ubuntu 24.04 LTS
bubblewrap 0.9.0-1ubuntu0.2
Ubuntu 22.04 LTS
bubblewrap 0.6.1-1ubuntu0.2
Ubuntu 20.04 LTS
bubblewrap 0.4.0-1ubuntu4.1+esm2
Available with Ubuntu Pro
Ubuntu 18.04 LTS
bubblewrap 0.2.1-1ubuntu0.1+esm2
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8779-1
CVE-2019-12439, CVE-2026-87766
Package Information:
https://launchpad.net/ubuntu/+source/bubblewrap/0.11.1-1ubuntu0.2
https://launchpad.net/ubuntu/+source/bubblewrap/0.9.0-1ubuntu0.2
https://launchpad.net/ubuntu/+source/bubblewrap/0.6.1-1ubuntu0.2
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