# CVE-2019-10063: flatpak: Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1 allows a sandbox bypass

CVE-2019-10063 is fixed in 5 products on 1 platform, first by flatpak 1.0.8-0ubuntu0.18.04.1, released March 26, 2019. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2019-10063
- Priority: High
- CVSS: 9.0 (Medium)
- EPSS: 0.0191
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 26, 2019

## Description

Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1 allows a sandbox bypass. Flatpak versions since 0.8.1 address CVE-2017-5226 by using a seccomp filter to prevent sandboxed apps from using the TIOCSTI ioctl, which could otherwise be used to inject commands into the controlling terminal so that they would be executed outside the sandbox after the sandboxed app exits. This fix was incomplete: on 64-bit platforms, the seccomp filter could be bypassed by an ioctl request number that has TIOCSTI in its 32 least significant bits and an arbitrary nonzero value in its 32 most significant bits, which the Linux kernel would treat as equivalent to TIOCSTI.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | flatpak RHEL 8 | 0:1.0.6-3.el8_0 | [RHSA-2019:1143](https://patchblox.com/security/data/fix/linux/rhsa-2019-1143.md) | May 13, 2019 |
| Linux | flatpak Ubuntu 18.04.6 LTS (bionic) | 1.0.8-0ubuntu0.18.04.1 | [flatpak 1.0.8-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-flatpak-1.0.8-0ubuntu0.18.04.1.md) | Mar 26, 2019 |
| Linux | flatpak ol 8 | 0:1.0.6-3.el8_0 | [ELSA-2019-1143](https://patchblox.com/security/data/fix/linux/elsa-2019-1143.md) | Jul 30, 2019 |
| Linux | flatpak-libs RHEL 8 | 0:1.0.6-3.el8_0 | [RHSA-2019:1143](https://patchblox.com/security/data/fix/linux/rhsa-2019-1143.md) | May 13, 2019 |
| Linux | flatpak-libs ol 8 | 0:1.0.6-3.el8_0 | [ELSA-2019-1143](https://patchblox.com/security/data/fix/linux/elsa-2019-1143.md) | Jul 30, 2019 |
| Linux | flatpak-tests Ubuntu 18.04.6 LTS (bionic) | 1.0.8-0ubuntu0.18.04.1 | [flatpak-tests 1.0.8-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-flatpak-tests-1.0.8-0ubuntu0.18.04.1.md) | Mar 26, 2019 |
| Linux | gir1.2-flatpak-1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.8-0ubuntu0.18.04.1 | [gir1.2-flatpak-1.0 1.0.8-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gir1.2-flatpak-1.0-1.0.8-0ubuntu0.18.04.1.md) | Mar 26, 2019 |
| Linux | libflatpak0 Ubuntu 18.04.6 LTS (bionic) | 1.0.8-0ubuntu0.18.04.1 | [libflatpak0 1.0.8-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libflatpak0-1.0.8-0ubuntu0.18.04.1.md) | Mar 26, 2019 |

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Data as of 2026-11-12T01:51:14Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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