PT-2026-66530 · Masci · Banks

CVE-2026-62663 · Published 2026-07-30 · Updated 2026-07-30

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Banks generates meaningful LLM prompts using a simple template language. In versions prior to 2.4.4, all four media filters (image, audio, video, document) in banks accept untrusted user input as file paths via Path(value) and pass them directly to open(file path, "rb") without any path sanitization, canonicalization, or directory restriction. An attacker who controls template variables passed to a banks Prompt can use path traversal (../) to read arbitrary files accessible to the Python process—including .env files, SSH keys, cloud credentials, source code, /etc/passwd, and /etc/shadow—with the content returned base64-encoded in the rendered prompt output, making exfiltration trivial. This is particularly dangerous for applications that use banks to process user-provided template variables before sending prompts to an LLM. This issue has been fixed in version 2.4.4.

Fix

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-62663

Affected Products

Banks

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-62663 · Security Note
• https://github.com/masci/banks/security/advisories/GHSA-98rr-gvc9-3cjh · Note