What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-26 · updated 2026-07-24
• Weakness: CWE-1336

Description

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 products

• masci banks: before 2.4.2

References

• https://github.com/masci/banks/pull/74
• https://github.com/masci/banks/security/advisories/GHSA-gphh-9q3h-jgpp
• https://access.redhat.com/security/cve/CVE-2026-44209
• https://bugzilla.redhat.com/show_bug.cgi?id=2481713
• https://github.com/masci/banks/security/advisories/GHSA-gphh-9q3h-jgpp
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44209.json

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