CVE-2026-90616
In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different
02 Description
In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.17% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 7.0% of scored records. A rank, not a probability.
- NVD base score
- 7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-09-22.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-09-12 20:00Z1 MO AGO
- Last updated
- 2026-09-14 18:22Z1 MO AGO
- Reserved
- 2026-09-12
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.4)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- e5c568546db3ebe3931009df2ab841426c035c394cec5f5bf8bbdc7d090ecb81
05 Affected products
06 References
07 Remediation
https://github.com/flatpak/flatpak/commit/478072972056d2d15c768c246f80abdf83cf0e5e
08 Fixed in
AlmaLinux 8
- flatpak Fixed in 1.12.9-7.el8_10
- flatpak-devel Fixed in 1.12.9-7.el8_10
- flatpak-libs Fixed in 1.12.9-7.el8_10
- flatpak-selinux Fixed in 1.12.9-7.el8_10
- flatpak-session-helper Fixed in 1.12.9-7.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- flatpak Fixed in 1.12.9-4.el9_8.4
- flatpak-devel Fixed in 1.12.9-4.el9_8.4
- flatpak-libs Fixed in 1.12.9-4.el9_8.4
- flatpak-selinux Fixed in 1.12.9-4.el9_8.4
- flatpak-session-helper Fixed in 1.12.9-4.el9_8.4
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- flatpak Fixed in 1.16.0-9.el10_2.4
- flatpak-devel Fixed in 1.16.0-9.el10_2.4
- flatpak-libs Fixed in 1.16.0-9.el10_2.4
- flatpak-selinux Fixed in 1.16.0-9.el10_2.4
- flatpak-session-helper Fixed in 1.16.0-9.el10_2.4
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- flatpak Fixed in 1.12.9-7.el8_10
- flatpak-devel Fixed in 1.12.9-7.el8_10
- flatpak-libs Fixed in 1.12.9-7.el8_10
- flatpak-selinux Fixed in 1.12.9-7.el8_10
- flatpak-session-helper Fixed in 1.12.9-7.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- flatpak Fixed in 1.12.9-4.el9_8.4
- flatpak-devel Fixed in 1.12.9-4.el9_8.4
- flatpak-libs Fixed in 1.12.9-4.el9_8.4
- flatpak-selinux Fixed in 1.12.9-4.el9_8.4
- flatpak-session-helper Fixed in 1.12.9-4.el9_8.4
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- flatpak Fixed in 1.16.0-9.el10_2.4
- flatpak-devel Fixed in 1.16.0-9.el10_2.4
- flatpak-libs Fixed in 1.16.0-9.el10_2.4
- flatpak-selinux Fixed in 1.16.0-9.el10_2.4
- flatpak-session-helper Fixed in 1.16.0-9.el10_2.4
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- flatpak No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- flatpak Fixed in 1.16.6-1~deb13u3
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- flatpak Fixed in 1.18.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 24.04 LTS
- flatpak No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.