Summary
USN-8779-1 fixed vulnerabilities in Bubblewrap. Unfortunately, the fix for
CVE-2026-87766 introduced a regression in symlink resolution, preventing
certain Flatpak applications from launching. This update reverts that fix
until a complete fix is available.
We apologize for the inconvenience.
Original advisory 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)
Fixed packages 5
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | bubblewrap | 0.6.1-1ubuntu0.3 |
| Ubuntu · 24.04 LTS 24.04:LTS | bubblewrap | 0.9.0-1ubuntu0.3 |
| Ubuntu · 26.04 LTS 26.04:LTS | bubblewrap | 0.11.1-1ubuntu0.3 |
| Ubuntu · Pro 18.04 LTS Pro:18.04:LTS | bubblewrap | 0.2.1-1ubuntu0.1+esm3 |
| Ubuntu · Pro 20.04 LTS Pro:20.04:LTS | bubblewrap | 0.4.0-1ubuntu4.1+esm3 |
References
-
report
https://bugs.launchpad.net/ubuntu/+source/bubblewrap/+bug/2167621