CVE-2026-44209: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine in masci banks
Banks generates meaningful LLM prompts using a template language that makes sense. Prior to 2.4.2, banks uses jinja2.Environment() (unsandboxed) to render prompt templates. Applications that pass user-supplied strings as the template argument to Prompt() are vulnerable to Server-Side Template Injection (SSTI), which can lead to Remote Code Execution (RCE) on the host system. This vulnerability is fixed in 2.4.2.
AI Analysis
Technical Summary
The masci banks product generates LLM prompts using a template language. Versions before 2.4.2 use jinja2.Environment() without sandboxing to render templates. If user input is passed directly as the template argument to the Prompt() function, it enables Server-Side Template Injection (SSTI). This SSTI vulnerability can be exploited to achieve remote code execution (RCE) on the host system. The issue is addressed by updating to version 2.4.2 where the vulnerability is fixed.
Potential Impact
Exploitation of this vulnerability allows an unauthenticated attacker with the ability to supply template strings to execute arbitrary code on the host system. This can lead to full compromise of the affected system, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
A fix is available in masci banks version 2.4.2. Users should upgrade to version 2.4.2 or later to remediate this vulnerability. No other vendor advisory mitigation instructions are provided. Patch status is confirmed by the vendor advisory.
CVE-2026-44209: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine in masci banks
Description
Banks generates meaningful LLM prompts using a template language that makes sense. Prior to 2.4.2, banks uses jinja2.Environment() (unsandboxed) to render prompt templates. Applications that pass user-supplied strings as the template argument to Prompt() are vulnerable to Server-Side Template Injection (SSTI), which can lead to Remote Code Execution (RCE) on the host system. This vulnerability is fixed in 2.4.2.
CVSS v3.1
Score 7.5high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The masci banks product generates LLM prompts using a template language. Versions before 2.4.2 use jinja2.Environment() without sandboxing to render templates. If user input is passed directly as the template argument to the Prompt() function, it enables Server-Side Template Injection (SSTI). This SSTI vulnerability can be exploited to achieve remote code execution (RCE) on the host system. The issue is addressed by updating to version 2.4.2 where the vulnerability is fixed.
Potential Impact
Exploitation of this vulnerability allows an unauthenticated attacker with the ability to supply template strings to execute arbitrary code on the host system. This can lead to full compromise of the affected system, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
A fix is available in masci banks version 2.4.2. Users should upgrade to version 2.4.2 or later to remediate this vulnerability. No other vendor advisory mitigation instructions are provided. Patch status is confirmed by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T15:13:47.571Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-44209","vendor":"Red Hat"}]
Threat ID: 6a174b8ce29bf47b50e4a247
Added to database: 05/27/2026, 19:52:44 UTC
Last enriched: 07/15/2026, 09:21:53 UTC
Last updated: 07/23/2026, 20:52:07 UTC
Views: 99
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