CVE-2026-31864 JumpServer has a Server-Side Template Injection Leading to RCE via YAML Rendering
Administrative users can execute arbitrary code in JumpServer via Server-Side Template Injection in YAML rendering.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-31864?
CVE-2026-31864 is a medium-severity code injection vulnerability in jumpserver, published on 13 Mar 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
JumpServer is an open source bastion host and an operation and maintenance security audit system. a Server-Side Template Injection (SSTI) vulnerability exists in JumpServer's Applet and VirtualApp upload functionality. This vulnerability can only be exploited by users with administrative privileges (Application Applet Management or Virtual Application Management permissions). Attackers can exploit this vulnerability to execute arbitrary code within the JumpServer Core container. The vulnerability arises from unsafe use of Jinja2 template rendering when processing user-uploaded YAML configuration files. When a user uploads an Applet or VirtualApp ZIP package, the manifest.yml file is rendered through Jinja2 without sandbox restrictions, allowing template injection attacks.
Weakness: CWE-1336
Which versions are affected by CVE-2026-31864?
It affects 1 product.
Products include Fit2cloud Jumpserver.
How do I fix CVE-2026-31864?
No fix has been published for CVE-2026-31864 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-31864 being exploited?
There is no known exploitation of CVE-2026-31864 in the wild and no public exploit code.
Other vulnerabilities in jumpserver
- CVE-2024-40628 Arbitrary File Read in Ansible Playbooks in Jumpserver
- CVE-2024-40629 Arbitrary File Write in Ansible Playbooks leads to RCE in Jumpserver
- CVE-2024-29201 JumpServer's insecure Ansible playbook validation leads to RCE in Celery
- CVE-2024-29202 JumpServer vulnerable to Jinja2 template injection in Ansible leads to RCE in Celery
- CVE-2023-48193 Security feature bypass in n/a
Sources
Also known as GHSA-qx8h-rx2j-j5wc.