CVE-2026-44209

Summary

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.

Affected Software

Weaknesses

• CWE-1336: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/masci/banks/security/advisories/GHSA-gphh-9q3h-jgpp

banks: banks: Remote Code Execution via Server-Side Template Injection

Additional References

• https://access.redhat.com/security/cve/CVE-2026-44209
• https://bugzilla.redhat.com/show_bug.cgi?id=2481713
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44209.json

References

• https://github.com/masci/banks/security/advisories/GHSA-gphh-9q3h-jgpp
• https://github.com/masci/banks/pull/74

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