CVE-2026-44209CWE-1336

Banks: Critical Remote Code Execution (RCE) via Jinja2 SSTI

High · published May 26, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
54.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00737 · 54.0th percentile
Weakness
CWE-1336 · Improper Neutralization of Special Elements Used in a Template Engine
Published
2026-05-26T20:46Z
EPSS history
Timeline
  • 26 MAY 20:46Z
    Banks: Critical Remote Code Execution (RCE) via Jinja2 SSTI
    cvelistv5