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CVE-2026-97027

Flatpak: flatpak: denial of service via unsanitized keys in exported desktop entry / d-bus service files

3.6 LowFix available

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.13%Unchanged since Sep 29, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.6

Flatpak: flatpak: denial of service via unsanitized keys in exported desktop entry / d-bus service files

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

Record
CVE-2026-97027
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
Weakness
CWE-20
Updated
2026-11-06
EUVDEUVD-2026-88554 3.6

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

Record
EUVD-2026-88554
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
Updated
2026-11-06
NVD 3.6

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

Record
CVE-2026-97027
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
Weakness
CWE-20
Updated
2026-11-06
OSVDEBIAN-CVE-2026-97027 3.6

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

Record
DEBIAN-CVE-2026-97027
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
Updated
2026-11-07
OSVUBUNTU-CVE-2026-97027 3.6

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

Record
UBUNTU-CVE-2026-97027
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
Updated
2026-11-02
OSVMGASA-2026-0477 No score

Updated flatpak package fixes security vulnerabilities

Arbitrary file deletion in root context via path traversal in deploy directory export/bin. (CVE-2026-97023) Arbitrary write in root context via path traversal in deploy directory files/etc. (CVE-2026-97024) World-readable oci authentication token in system-helper cache path. (CVE-2026-97025) World-writable temporary child repositories in system-helper cache path. (CVE-2026-97026) Denial of service via unsanitized keys in exported desktop entry / d-bus service files. (CVE-2026-97027) Sandboxed app can signal unsandboxed processes in the same process group. (CVE-2026-97029)

Record
MGASA-2026-0477
Updated
2026-11-02
OSVopenSUSE-SU-2026:11918-1 No score

flatpak-1.18.4-1.1 on GA media

These are all security issues fixed in the flatpak-1.18.4-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11918-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
flatpak
Debian:12
 All versions, plus listed versions
1.14.10-11.14.10-1~deb12u11.14.10-1~deb12u21.14.4-11.14.4-1+deb12u1
Show 45 moreShow less
1.14.4-1+deb12u1~bpo11+11.14.4-21.14.5-11.14.6-11.14.6-1~deb13u11.14.8-11.14.8-1~deb12u11.15.0-11.15.0-21.15.1-11.15.10-11.15.12-11.15.2-11.15.3-11.15.4-11.15.6-11.15.7-11.15.8-11.15.9-11.15.91-11.16.0-11.16.0-21.16.0-2~bpo12+11.16.1-11.16.1-1~bpo12+11.16.1-21.16.1-31.16.2-11.16.2-1~deb13u11.16.3-11.16.3-1~deb13u11.16.4-11.16.4-21.16.5-11.16.6-11.16.6-1~deb13u11.16.6-1~deb13u1~bpo12+11.16.6-1~deb13u21.16.6-1~deb13u31.17.2-11.17.3-11.17.3-21.17.6-11.18.0-11.18.1-1
 None known
flatpak
Debian:13
 before 1.16.6-1~deb13u3, plus listed versions
1.16.1-11.16.1-21.16.1-31.16.2-11.16.2-1~deb13u1
Show 8 moreShow less
1.16.3-11.16.3-1~deb13u11.16.4-11.16.4-21.16.5-11.16.6-1~deb13u11.16.6-1~deb13u1~bpo12+11.16.6-1~deb13u2
1.16.6-1~deb13u3
flatpak
Debian:14
 before 1.18.4-1, plus listed versions
1.16.1-11.16.1-21.16.1-31.16.2-11.16.2-1~deb13u1
Show 18 moreShow less
1.16.3-11.16.3-1~deb13u11.16.4-11.16.4-21.16.5-11.16.6-11.16.6-1~deb13u11.16.6-1~deb13u1~bpo12+11.16.6-1~deb13u21.16.6-1~deb13u31.17.2-11.17.3-11.17.3-21.17.6-11.18.0-11.18.1-11.18.2-11.18.3-1
1.18.4-1
flatpak
Mageia:10
From an advisory covering 6 CVEs
 before 1.16.6-1.2.mga10
1.16.6-1.2.mga10
flatpak
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
0.8.7-50.10.0-10.10.0-20.10.1-10.10.2-1
Show 16 moreShow less
0.10.2.1-10.10.2.1-20.10.3-10.11.1-0ubuntu10.11.3-20.11.3-30.11.7-0ubuntu0.11.0.1-0ubuntu0.11.0.6-0ubuntu0.11.0.7-0ubuntu0.18.04.11.0.8-0ubuntu0.18.04.11.0.9-0ubuntu0.11.0.9-0ubuntu0.21.0.9-0ubuntu0.31.0.9-0ubuntu0.41.0.9-0ubuntu0.4+esm1
 None known
flatpak
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1.4.3-11.6.0-11.6.1-11.6.2-11.6.3-1
Show 6 moreShow less
1.6.5-0ubuntu0.11.6.5-0ubuntu0.21.6.5-0ubuntu0.31.6.5-0ubuntu0.41.6.5-0ubuntu0.51.6.5-0ubuntu0.5+esm1
 None known
flatpak
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1.10.2-31.12.2-11.12.2-21.12.3-11.12.4-1
Show 5 moreShow less
1.12.5-11.12.6-11.12.7-11.12.7-1ubuntu0.11.12.7-1ubuntu0.1+esm1
 None known
flatpak
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1.14.4-21.14.5-11.14.5-1build11.14.5-1build41.14.5-1build5
Show 4 moreShow less
1.14.5-1build61.14.6-11.14.6-1ubuntu0.11.14.6-1ubuntu0.1+esm1
 None known
flatpak
Ubuntu:26.10
 All versions, plus listed versions
1.16.6-11.18.0-11.18.1-11.18.2-11.18.4-1
 None known
flatpak
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.16.1-2ubuntu11.16.1-3ubuntu11.16.2-11.16.3-11.16.3-1build11.16.4-11.16.4-21.16.6-1
 None known
flatpak
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 1.18.4-1.1
1.18.4-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-97027 is a low vulnerability (CVSS 3.6) in Red Hat Enterprise Linux 10, published September 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.13%, the 2nd percentile. Fixed in flatpak 1.16.6-1~deb13u3.

References

Show 15 moreShow less
This page doesn't list everything

Left out here: 3 versions. The JSON record has them.

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