Security Bulletin
Summary
HashiCorp Nomad and Nomad Enterprise did not enforce the allow_privileged restriction for the Docker task driver's host namespace mode options. This may allow an authenticated job submitter to run a container in a host namespace and access information belonging to the host or to other workloads on the same client. This vulnerability, CVE-2026-14373, is fixed in Nomad Community Edition 2.0.4 and Nomad Enterprise 2.0.4, 1.11.8, and 1.10.14.
Vulnerability Details
CVEID: CVE-2026-14373
DESCRIPTION: The Docker task driver passed the process, IPC, user, and UTS namespace mode options from a submitted job to the Docker daemon without enforcing the allow_privileged restriction described in its documentation. As a result, an authenticated user able to submit Docker driver jobs could place a container in a host namespace even on clients where allow_privileged was disabled. Running a task in the host process namespace, for example, allows the container to enumerate host processes and read their environment, which may expose sensitive information such as tokens or credentials held by the Nomad agent or by other allocations on the same client. Exploitation requires the ability to submit Docker driver jobs to the cluster. These host namespace modes are specific to Linux, so the issue affects Linux clients running Linux containers; Windows container workloads are not affected.
CWE: CWE-862: Missing Authorization
CVSS Source: HashiCorp Inc.
CVSS Base score: 7.7
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Nomad Community Edition | affected from 0.4.1 up to 2.0.4 |
| Nomad Enterprise | affected from 0.4.1 up to 2.0.4, unaffected from 1.11.8, 1.10.14 |
Remediation/Fixes
Customers should evaluate the risk associated with this issue and consider upgrading to Nomad Community Edition 2.0.4 or Nomad Enterprise 2.0.4, 1.11.8, and 1.10.14. Nomad Enterprise customers that are unable to upgrade can implement a Sentinel policy to restrict host namespaces for Docker tasks. The following policy restricts host namespaces: ``` check_task_config = func(task) { if task.driver == "docker" { if task.config.ipc_mode is defined and task.config.ipc_mode is "host" { return false } if task.config.pid_mode is defined and task.config.pid_mode is "host" { return false } if task.config.uts_mode is defined and task.config.uts_mode is "host" { return false } if task.config.userns_mode is defined and task.config.userns_mode is "host" { return false } } return true } restrict_host_namespaces = rule { all job.task_groups as tg { all tg.tasks as task { check_task_config(task) } } } main = rule { restrict_host_namespaces ``` This policy can be applied to Nomad Enterprise clusters with: nomad sentinel apply -level hard-mandatory -scope=submit-job restrict-host-namespace ./policy.hcl.
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References
Acknowledgement
This issue was reported to HashiCorp by Deniz Onur Duzgun (@dduzgun-security).
Change History
08 Jul 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
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Document Location
Worldwide
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Document Information
Modified date:
08 July 2026
Initial Publish date:
08 July 2026
UID
ibm17279453