CVE-2026-35477: InvenTree has SSTI in PART_NAME_FORMAT bypasses CVE-2026-27629 fix via {% if part.pk %} sandbox escape
InvenTree is an Open Source Inventory Management System. From 1.2.3 to 1.2.6, the fix for CVE-2026-27629 upgraded the PARTNAMEFORMAT validator to use jinja2.sandbox.SandboxedEnvironment. However, the actual renderer in part/helpers.py was not updated and still uses the non-sandboxed jinja2.Environment. Additionally, the validator uses a dummy Part instance with pk=None, which allows conditional template expressions to behave differently during validation versus production rendering. A staff user with settings access can craft a template that passes validation but executes arbitrary code during rendering. This issue requires access by a user with granted staff permissions. This vulnerability is fixed in 1.2.7 and 1.3.0.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
InvenTreeto a version that resolves this vulnerability.Fixed in 1.2.7 - Upgrade
Upgrade
InvenTreeto a version that resolves this vulnerability.Fixed in 1.3.0 - Upgrade
Upgrade
InvenTree (PART_NAME_FORMAT validator: PART_NAME_FORMAT validator)to a version that resolves this vulnerability.Patch CVE-2026-27629
Event History
Frequently Asked Questions
What is the severity of CVE-2026-35477?
CVE-2026-35477 has a critical severity rating of 9.9.
How do I fix CVE-2026-35477?
To fix CVE-2026-35477, you should update to the latest version of InvenTree which includes the patched code for the vulnerability.
What vulnerability does CVE-2026-35477 address?
CVE-2026-35477 addresses a Server-Side Template Injection (SSTI) vulnerability that bypasses the fix implemented for CVE-2026-27629.
What systems are affected by CVE-2026-35477?
CVE-2026-35477 affects InvenTree versions from 1.2.3 to 1.2.6.
What kind of attack can exploit CVE-2026-35477?
CVE-2026-35477 can be exploited through Server-Side Template Injection, allowing attackers to execute arbitrary code in the application context.