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CVE-2026-31864— JumpServer has a Server-Side Template Injection Leading to RCE via YAML Rendering

Quick assessment

Affected
jumpserver jumpserver
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JumpServer是中国杭州飞致云信息科技（JumpServer）公司的一款开源堡垒机。 JumpServer存在安全漏洞，该漏洞源于Applet和VirtualApp上传功能中Jinja2模板渲染使用不安全，可能导致具有管理权限的攻击者执行任意代码。

CVSS 6.8 · Medium EPSS 0.52% · P42
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I. Basic Information for CVE-2026-31864

Vulnerability Information
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Vulnerability Title
JumpServer has a Server-Side Template Injection Leading to RCE via YAML Rendering
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
JumpServer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JumpServer是中国杭州飞致云信息科技（JumpServer）公司的一款开源堡垒机。 JumpServer存在安全漏洞，该漏洞源于Applet和VirtualApp上传功能中Jinja2模板渲染使用不安全，可能导致具有管理权限的攻击者执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jumpserver jumpserver < 3.10.22 -

II. Public POCs for CVE-2026-31864

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III. Intelligence Information for CVE-2026-31864

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Patches & Fixes for CVE-2026-31864 (1)

Vendor Advisories for CVE-2026-31864 (1)

IV. Related Vulnerabilities

Same product: jumpserver
Same vendor: jumpserver
Same weakness: CWE-1336

V. Comments for CVE-2026-31864

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