# CVE-2021-21381: flatpak: Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.  Security Fix(es...

CVE-2021-21381 is fixed in 7 products on 1 platform, first by flatpak 1.0.9-0ubuntu0.3, released March 11, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-21381
- Priority: High
- CVSS: 8.2 (Important)
- EPSS: 0.0155
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 11, 2021

## Description

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.  Security Fix(es):  * flatpak: "file forwarding" feature can be used to gain unprivileged access to files (CVE-2021-21381)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | flatpak RHEL 8 | 0:1.6.2-6.el8_3 | [RHSA-2021:1068](https://patchblox.com/security/data/fix/linux/rhsa-2021-1068.md) | Apr 6, 2021 |
| Linux | flatpak Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.3 | [flatpak 1.0.9-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-flatpak-1.0.9-0ubuntu0.3.md) | Mar 11, 2021 |
| Linux | flatpak Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.3 | [flatpak 1.6.5-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-flatpak-1.6.5-0ubuntu0.3.md) | Mar 11, 2021 |
| Linux | flatpak ol 8 | 0:1.6.2-6.el8_3 | [ELSA-2021-1068](https://patchblox.com/security/data/fix/linux/elsa-2021-1068.md) | Apr 7, 2021 |
| Linux | flatpak-libs RHEL 8 | 0:1.6.2-6.el8_3 | [RHSA-2021:1068](https://patchblox.com/security/data/fix/linux/rhsa-2021-1068.md) | Apr 6, 2021 |
| Linux | flatpak-libs ol 8 | 0:1.6.2-6.el8_3 | [ELSA-2021-1068](https://patchblox.com/security/data/fix/linux/elsa-2021-1068.md) | Apr 7, 2021 |
| Linux | flatpak-selinux RHEL 8 | 0:1.6.2-6.el8_3 | [RHSA-2021:1068](https://patchblox.com/security/data/fix/linux/rhsa-2021-1068.md) | Apr 6, 2021 |
| Linux | flatpak-selinux ol 8 | 0:1.6.2-6.el8_3 | [ELSA-2021-1068](https://patchblox.com/security/data/fix/linux/elsa-2021-1068.md) | Apr 7, 2021 |
| Linux | flatpak-session-helper RHEL 8 | 0:1.6.2-6.el8_3 | [RHSA-2021:1068](https://patchblox.com/security/data/fix/linux/rhsa-2021-1068.md) | Apr 6, 2021 |
| Linux | flatpak-session-helper ol 8 | 0:1.6.2-6.el8_3 | [ELSA-2021-1068](https://patchblox.com/security/data/fix/linux/elsa-2021-1068.md) | Apr 7, 2021 |
| Linux | flatpak-tests Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.3 | [flatpak-tests 1.0.9-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-flatpak-tests-1.0.9-0ubuntu0.3.md) | Mar 11, 2021 |
| Linux | flatpak-tests Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.3 | [flatpak-tests 1.6.5-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-flatpak-tests-1.6.5-0ubuntu0.3.md) | Mar 11, 2021 |
| Linux | gir1.2-flatpak-1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.3 | [gir1.2-flatpak-1.0 1.0.9-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gir1.2-flatpak-1.0-1.0.9-0ubuntu0.3.md) | Mar 11, 2021 |
| Linux | gir1.2-flatpak-1.0 Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.3 | [gir1.2-flatpak-1.0 1.6.5-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gir1.2-flatpak-1.0-1.6.5-0ubuntu0.3.md) | Mar 11, 2021 |
| Linux | libflatpak0 Ubuntu 18.04.6 LTS (bionic) | 1.0.9-0ubuntu0.3 | [libflatpak0 1.0.9-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libflatpak0-1.0.9-0ubuntu0.3.md) | Mar 11, 2021 |
| Linux | libflatpak0 Ubuntu 20.04 LTS (focal) | 1.6.5-0ubuntu0.3 | [libflatpak0 1.6.5-0ubuntu0.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libflatpak0-1.6.5-0ubuntu0.3.md) | Mar 11, 2021 |

---

Data as of 2026-11-09T13:31:49Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.