Flatpak 1.19 was released today as a new development release along with the Flatpak 1.18.1 stable point release. Both of these releases ship a number of newly-discovered security issues with this app sandboxing and distribution tech.

There are nine security fixes to Flatpak 1.19 and ten for Flatpak 1.18.1. These security fixes include a a possible sandbox escape with full host file-system read/write access via a symlink attack. There is also a local root privilege escalation vulnerability via revokefs symlink path traversal. There are also multiple arbitrary root read/writes, a possible buffer overflow on 32-bit systems, and other security issues resolved.

Flatpak 1.19 on the feature side now allows system-wide downgrades through the system helper, improved Bash completion, and other enhancements and fixes.

The full list of Flatpak 1.19 changes can be found via GitHub . See the 1.18.1 tag for all of the security and bug fixes there.