CVE-2026-34078
Description
RHSA-2026:21756: flatpak security update (Important)
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
Description flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options Red Hat statement This Important flaw in Flatpak allows a malicious Flatpak application to escape its sandbox and achieve arbitrary code execution on the host system. By exploiting specially crafted symlinks within the `sandbox-expose` options, the integrity of the Flatpak sandboxing mechanism, a…
Description
flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options
Red Hat statement
This Important flaw in Flatpak allows a malicious Flatpak application to escape its sandbox and achieve arbitrary code execution on the host system. By exploiting specially crafted symlinks within the `sandbox-expose` options, the integrity of the Flatpak sandboxing mechanism, a critical security feature in Red Hat environments, is compromised.
CVSS v3: 9.0 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H)
Package state
| Product | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 10 | flatpak | Affected |
| Red Hat Enterprise Linux 7 | flatpak | Affected |
| Red Hat Enterprise Linux 8 | flatpak | Affected |
| Red Hat Enterprise Linux 9 | flatpak | Affected |
Affected
| Vendor | Product | Version |
|---|---|---|
| redhat | Red Hat Enterprise Linux 10 | Affected |
| redhat | Red Hat Enterprise Linux 7 | Affected |
| redhat | Red Hat Enterprise Linux 8 | Affected |
| redhat | Red Hat Enterprise Linux 9 | Affected |
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1.16.6-1~deb13u1 |
| sid | Fixed | 1.16.4-1 |
| forky | Fixed | 1.16.4-1 |
| bullseye | Affected | — |
| bookworm | Fixed | 1.14.10-1~deb12u2 |
AlmaLinux Fixed 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 9 | Fixed | flatpak-libs-1.12.9-4.el9_8.1.i686.rpm |
| 8 | Fixed | flatpak-session-helper-1.12.9-4.el8_10.i686.rpm |
Red Hat Fixed 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 9 | Fixed | — |
| 8 | Fixed | — |
References
- https://security-tracker.debian.org/tracker/CVE-2026-34078
- https://www.suse.com/security/cve/CVE-2026-34078.html
- https://access.redhat.com/errata/RHSA-2026:21756
- https://bugzilla.redhat.com/2456276
- https://bugzilla.redhat.com/2456284
- https://errata.almalinux.org/8/ALSA-2026-21756.html
- https://access.redhat.com/errata/RHSA-2026:21755
- https://errata.almalinux.org/9/ALSA-2026-21755.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.