CVE-2026-14891 Nomad vulnerable to sandbox escape in Docker task driver
A job submitter can bypass volume restrictions to bind-mount host paths, enabling unauthorized reading and writing of host files.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-14891?
CVE-2026-14891 is a high-severity path traversal vulnerability in HashiCorp Nomad, published on 8 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
HashiCorp Nomad and Nomad Enterprise are vulnerable to a sandbox escape in the Docker task driver that may allow a job submitter to bind-mount a host path into a container even when volume bind mounts are disabled, potentially leading to reading and writing files on the host. This vulnerability, CVE-2026-14891, is fixed in Nomad Community Edition 2.0.4 and Nomad Enterprise 2.0.4, 1.11.8, and 1.10.14.
Weakness: CWE-59
Which versions are affected by CVE-2026-14891?
How do I fix CVE-2026-14891?
No fix has been published for CVE-2026-14891 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-14891 being exploited?
There is no known exploitation of CVE-2026-14891 in the wild and no public exploit code.
Sources
Also known as GHSA-5c56-jfhx-4gcm, UBUNTU-CVE-2026-14891.