CVE-2026-44209: SSTI to RCE in banks LLM prompt template library
Versions of the banks LLM prompt-templating library before 2.4.2 rendered prompt templates with an unsandboxed jinja2.Environment(), so applications passing user-supplied strings as templates to Prompt() were vulnerable to server-side template injection leading to remote code execution. The issue is fixed in version 2.4.2.
Disclosed 26 May 2026 · Record updated 13 September 2026
Impact
Server-side template injection in prompt rendering could allow remote code execution on the host system of applications using banks with user-supplied templates.
Our coverage
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Sources
- nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-44209
