CVE-2026-107717

Banks generates meaningful LLM prompts using a simple template language. Prior to 2.5.0, Banks Prompt.chat_messages() attempts to parse every line of rendered template output as ChatMessage JSON. When an application renders untrusted data and passes the returned ChatMessage objects to an LLM provider, attacker-controlled JSON can cross the prompt boundary and become a system, assistant, or tool message because ChatMessage.role accepts arbitrary strings. This can override application instructions, alter the intended prompt structure, or confuse downstream tool and message handling. This issue is fixed in version 2.5.0.

• CWE-20

• https://github.com/masci/banks/commit/02172b816fb84f6a824cc09a8aca7416f53c12cb
• https://github.com/masci/banks/pull/78
• https://github.com/masci/banks/releases/tag/v2.5.0
• https://github.com/masci/banks/security/advisories/GHSA-hmq2-7hp6-7crh

Published

Oct 8, 2026

Last Modified

Oct 8, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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