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CVE-2026-123039

High CVSS 7.8 Known exploited

Published 2026-11-12 · last changed 2026-11-14 · added to CISA KEV 2026-11-13

This one is being exploited in the wild.

CISA added CVE-2026-123039 to the Known Exploited Vulnerabilities catalog on 2026-11-13. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2026-123039, which normally means it isn't a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release. The vendor's advisory has the affected and fixed versions.

What it is

The Gaia OS DynamicCLI daemon runs as root and listens on a world-writable local socket (/tmp/dynamic_socket) without authenticating connecting processes. An authenticated local user can send a command to the socket and have it executed as root.

Sources

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H