Vulnerability · Published Sep 4, 2026 · Assigned by redhat

CVE-2026-76925Flatpak: flatpak: toctou race condition allows symlink redirection

Medium 5.8

In plain English

A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)5.8Medium

Exploit odds (30 days)0.1%top 99.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:26.04:LTS	flatpak	no fix listed	UBUNTU-CVE-2026-76925
Ubuntu:26.10	flatpak	no fix listed	UBUNTU-CVE-2026-76925

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 10	see references
Red Hat	Red Hat Enterprise Linux 7	see references
Red Hat	Red Hat Enterprise Linux 8	see references
Red Hat	Red Hat Enterprise Linux 9	see references

Weakness: CWE-367 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L

References

https://access.redhat.com/security/cve/CVE-2026-76925 vdb-entry, x_refsource_REDHAT
RHBZ#2520099 issue-tracking, x_refsource_REDHAT