How severe is CVE-2026-97026?

CVE-2026-97026 has a CVSS 3.x base score of 3.9, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2026-97026 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-97026?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-97026 published?

CVE-2026-97026 was published on 2026-09-28 and last updated on 2026-09-30.

CVE-2026-97026

CVE-2026-97026 is a low-severity vulnerability with a CVSS 3.x base score of 3.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-378.

Key facts

Severity: Low (CVSS 3.x base score 3.9)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-378
Published: 2026-09-28
Last modified: 2026-09-30

Description

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.

Frequently asked questions

What is CVE-2026-97026?: 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.
How severe is CVE-2026-97026?: CVE-2026-97026 has a CVSS 3.x base score of 3.9, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2026-97026 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-97026?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-97026 published?: CVE-2026-97026 was published on 2026-09-28 and last updated on 2026-09-30.

References

Other CWE-378 vulnerabilities

CVE-2024-39872 — Critical (CVSS 9.6): A vulnerability has been identified in SINEMA Remote Connect Server (All versions < V3.2 SP1). The affected application…
CVE-2026-25265 — High (CVSS 8.8): Privilege escalation due to weak configuration while temporary file handling.
CVE-2025-32438 — High (CVSS 8.8): make-initrd-ng is a tool for copying binaries and their dependencies. Local privilege escalation affecting all NixOS…
CVE-2025-27148 — High (CVSS 8.8): Gradle is a build automation tool, and its native-platform tool provides Java bindings for native APIs. On Unix-like…
CVE-2021-29428 — High (CVSS 8.8): In Gradle before version 7.0, on Unix-like systems, the system temporary directory can be created with open permissions…
CVE-2026-33572 — High (CVSS 8.4): OpenClaw before 2026.2.17 creates session transcript JSONL files with overly broad default permissions, allowing local…

Browse all CWE-378 vulnerabilities →