EUVD-2026-28531
GHSA-979m-gf7m-rg53
Severity by source
AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
In OpenStack Ironic through 35.x, instance_info['ks_template'] is rendered without sandboxing.
AnalysisAI
Server-side template injection in OpenStack Ironic through version 35.x allows authenticated administrators to disclose sensitive information by rendering unsandboxed Jinja2 templates in the instance_info['ks_template'] parameter. The vulnerability requires high-privilege user interaction and has low confidentiality impact with no integrity or availability consequences.
Technical ContextAI
OpenStack Ironic is a bare-metal provisioning service that uses Jinja2 templating for kernel command-line generation during instance deployment. The vulnerability exists in template rendering logic where the 'ks_template' field within instance_info metadata is processed without proper sandboxing or context isolation. CWE-1336 (Improper Neutralization of Special Elements used in a Template Engine) indicates the root cause is unsanitized template variable interpolation. When Ironic renders this template, an authenticated operator with high privileges can embed Jinja2 expression syntax to access template context variables that may contain sensitive deployment information, credential references, or internal configuration details.
RemediationAI
Apply the security patch available via OpenStack Ironic upstream releases following version 35.x; consult the LaunchPad bug tracker (https://bugs.launchpad.net/ironic/+bug/2148307) for exact patched version availability and timeline. As an interim compensating control, restrict the ability to set or modify instance_info['ks_template'] to a minimal set of trusted administrators and audit all template modifications. Additionally, implement Jinja2 template sandboxing at the Ironic configuration level if available (e.g., using restricted environments or environment subclasses), or disable dynamic template rendering for ks_template and use pre-approved static kernel command-line templates instead. These workarounds trade operational flexibility for security but eliminate the SSTI surface.
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