CVE-2026-76925
Flatpak: flatpak: toctou race condition allows symlink redirection
- State
- Published
- Severity
- 5.8 Medium
- Published
- Sep 4, 2026
- Updated
- Oct 16, 2026
- Reserved
- Aug 19, 2026
Description
A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmod` operation executes before the OSTree repository validation within the `Deploy()` function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.8 Medium | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L | redhat |
Weaknesses
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Products
| Product | Versions |
|---|---|
Red Hat Enterprise Linux 10Red Hat | |
Red Hat Enterprise Linux 7Red Hat | |
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Enterprise Linux 9Red Hat |
References
- https://access.redhat.com/security/cve/CVE-2026-76925vdb-entry
- RHBZ#2520099issue-tracking
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