CVE-2026-14891 PUBLISHED

Nomad vulnerable to sandbox escape in Docker task driver

Assigner: HashiCorp
Reserved: 06.07.2026 Published: 08.07.2026 Updated: 09.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
CVSS Score: 8.7

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	High	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	HashiCorp
Product	Nomad
Versions	Default: unaffected affected from 0.4.1 to 2.0.4 (excl.)

Vendor	HashiCorp
Product	Nomad Enterprise
Versions	Default: unaffected affected from 0.4.1 to 2.0.4 (excl.)

Credits

This issue was reported to HashiCorp by Volkan Kutal, GitHub handle @KutalVolkan.

References

https://discuss.hashicorp.com/t/hcsec-2026-21-nomad-vulnerable-to-sandbox-escape-in-docker-task-driver/77561

Problem Types

CWE-59: Improper Link Resolution Before File Access (Link Following) CWE

Impacts

CAPEC-132: Symlink Attack