Time-of-check Time-of-use (TOCTOU) Race Condition in Docker Sandboxes - CVE-2026-79994
Published: September 16, 2026
Vulnerability identifier: #VU150199
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-79994
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose data or access host-side capabilities.
The vulnerability exists due to a time-of-check time-of-use race condition in the guest-to-host Unix domain socket relay when reconnecting to a Unix domain socket after validating its path. A local user can replace an intermediate directory with a symbolic link between the path check and connection to cause the host to connect to an arbitrary AF_UNIX socket outside the shared workspace.
Affected software
Docker Sandboxes
How to mitigate CVE-2026-79994
Install security update from vendor's website.
Docker Sandboxes - update to 0.42.0