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CVE-2026-97026

Flatpak: flatpak: world-writable temporary child repositories in system-helper cache path

3.9 LowFix available

Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

0.10%Unchanged since Sep 29, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.9

Flatpak: flatpak: world-writable temporary child repositories in system-helper cache path

Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.

Record
CVE-2026-97026
CVSS 3.1
3.9 LowCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-378
Updated
2026-11-06
EUVDEUVD-2026-88553 3.9

Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.

Record
EUVD-2026-88553
CVSS 3.1
3.9 LowCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-06
NVD 3.9

Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.

Record
CVE-2026-97026
CVSS 3.1
3.9 LowCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-378
Updated
2026-11-06
OSVDEBIAN-CVE-2026-97026 3.9

Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.

Record
DEBIAN-CVE-2026-97026
CVSS 3.1
3.9 LowCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-07
OSVUBUNTU-CVE-2026-97026 3.9

Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.

Record
UBUNTU-CVE-2026-97026
CVSS 3.1
3.9 LowCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/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-2026-97026 is a low vulnerability (CVSS 3.9) 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 0.10%, the 1st percentile. Fixed in flatpak 1.16.6-1~deb13u3.

References

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

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