Is CVE-2026-96808 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-96808 being exploited in the wild.

How severe is CVE-2026-96808?

High severity, with a CVSS score of 7.4, published 23 September 2026.

Which products and versions are affected?

Freedesktop Flatpak before 1.18.1.

Is there a fix for CVE-2026-96808?

A patch was published on 2026-08-11: Fixed in 1.18.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-96808 attacked?

It is attacked with local access.

Am I affected by CVE-2026-96808?

Check whether you run Freedesktop Flatpak at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-96808: Flatpak revokefs symlink path traversal privilege escalation

CVE-2026-96808 · Severity: high · CVSS 7.4 · Published 2026-09-23

Flatpak is a containerization system that isolates applications on Linux systems. A flaw in its system helper component allows a local attacker with an active session to bypass file path validation through symlink traversal, tamper with signed application runtimes, and gain root privileges. An attacker could write arbitrary files to the system with elevated privileges.

Vendors: Freedesktop.

Quick answers

Is CVE-2026-96808 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-96808 being exploited in the wild.
How severe is CVE-2026-96808?: High severity, with a CVSS score of 7.4, published 23 September 2026.
Which products and versions are affected?: Freedesktop Flatpak before 1.18.1.
Is there a fix for CVE-2026-96808?: A patch was published on 2026-08-11: Fixed in 1.18.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-96808 attacked?: It is attacked with local access.
Am I affected by CVE-2026-96808?: Check whether you run Freedesktop Flatpak at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The revokefs writer in flatpak-system-helper validates file paths by rejecting literal ".." components but fails to prevent symlink traversal. An attacker with local access can obtain two revokefs sessions, create a symlink in one pointing to the other's directory, and retain a file descriptor to modify validated files. This enables tampering with ostree commit objects after signature verification, leading to root-controlled arbitrary file writes and local privilege escalation.

Affected products

freedesktop Flatpak before 1.18.1

Timeline

2026-08-11: disclosed
2026-09-23: advisory
2026-08-11: patched: Fixed in 1.18.1

References

https://github.com/flatpak/flatpak/security/advisories/GHSA-qrwq-7qwx-q9rp

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