CVE-2026-34078
Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
02 Description
Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
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.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 1.68% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 76.7% of scored records. A rank, not a probability.
- NVD base score
- 9.3 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVD analysis status
- Modified. NVD last modified this record on 2026-07-24.
- 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
- 2026-04-07 21:27Z6 MO AGO
- Last updated
- 2026-07-15 01:04Z3 MO AGO
- Reserved
- 2026-03-25
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.3)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Weaknesses
- Data version
- 5.2
- Document digest
- 7173125b5f745a545d584aae2270f3399a4831649923e56b7bcdfcb1e25e0364
05 Affected products
06 References
- github.comhttps://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/04/09/8
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/04/10/14
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-34078
- bugzilla.redhat.comRHBZ#2456276https://bugzilla.redhat.com/show_bug.cgi?id=2456276
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34078.json
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:35843
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:23420
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:21757
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:21756
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:30901
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:25381
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:25068
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:23419
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:23417
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:23418
- access.redhat.comhttps://access.redhat.com/errata/RHSA-2026:21755
07 Fixed in
AlmaLinux 8
- flatpak Fixed in 1.12.9-4.el8_10
- flatpak-devel Fixed in 1.12.9-4.el8_10
- flatpak-libs Fixed in 1.12.9-4.el8_10
- flatpak-selinux Fixed in 1.12.9-4.el8_10
- flatpak-session-helper Fixed in 1.12.9-4.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_8.1
- flatpak-devel Fixed in 1.12.9-4.el9_8.1
- flatpak-libs Fixed in 1.12.9-4.el9_8.1
- flatpak-selinux Fixed in 1.12.9-4.el9_8.1
- flatpak-session-helper Fixed in 1.12.9-4.el9_8.1
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_2.1
- flatpak-devel Fixed in 1.16.0-9.el10_2.1
- flatpak-libs Fixed in 1.16.0-9.el10_2.1
- flatpak-selinux Fixed in 1.16.0-9.el10_2.1
- flatpak-session-helper Fixed in 1.16.0-9.el10_2.1
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 1.12.9-4.el8_10
- flatpak-devel Fixed in 1.12.9-4.el8_10
- flatpak-libs Fixed in 1.12.9-4.el8_10
- flatpak-selinux Fixed in 1.12.9-4.el8_10
- flatpak-session-helper Fixed in 1.12.9-4.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_8.1
- flatpak-devel Fixed in 1.12.9-4.el9_8.1
- flatpak-libs Fixed in 1.12.9-4.el9_8.1
- flatpak-selinux Fixed in 1.12.9-4.el9_8.1
- flatpak-session-helper Fixed in 1.12.9-4.el9_8.1
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_2.1
- flatpak-devel Fixed in 1.16.0-9.el10_2.1
- flatpak-libs Fixed in 1.16.0-9.el10_2.1
- flatpak-selinux Fixed in 1.16.0-9.el10_2.1
- flatpak-session-helper Fixed in 1.16.0-9.el10_2.1
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 Fixed in 1.14.10-1~deb12u2
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~deb13u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- flatpak Fixed in 1.16.4-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- 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 Fixed in 1.6.5-0ubuntu0.5+esm1Available with Ubuntu Pro: https://ubuntu.com/pro
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 Fixed in 1.12.7-1ubuntu0.1+esm1Available with Ubuntu Pro: https://ubuntu.com/pro
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 Fixed in 1.14.6-1ubuntu0.1+esm1Available with Ubuntu Pro: https://ubuntu.com/pro
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.