CVE-2026-44209: banks has Critical Remote Code Execution (RCE) via Jinja2 SSTI

May 8, 2026

banks <= 2.4.1 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 is a vulnerability in how banks initializes its Jinja2 environment — not in Jinja2 itself.

References

github.com/advisories/GHSA-gphh-9q3h-jgpp
github.com/masci/banks
github.com/masci/banks/pull/74
github.com/masci/banks/security/advisories/GHSA-gphh-9q3h-jgpp
nvd.nist.gov/vuln/detail/CVE-2026-44209

Code Behaviors & Features

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