masci banks up to 2.4.4 DirectoryPromptRegistry directory.py DirectoryPromptRegistry.set name/version path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in masci banks up to 2.4.4. Affected by this issue is the function DirectoryPromptRegistry.set of the file src/banks/registries/directory.py of the component DirectoryPromptRegistry. The manipulation of the argument name/version leads to path traversal. This vulnerability is traded as CVE-2026-71492. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in masci banks up to 2.4.4. This issue affects the function DirectoryPromptRegistry.set of the file src/banks/registries/directory.py of the component DirectoryPromptRegistry. The manipulation of the argument name/version with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Banks generates meaningful LLM prompts using a simple template language. Prior to version 2.4.5, DirectoryPromptRegistry.set() in src/banks/registries/directory.py interpolates attacker-controlled Prompt.name and Prompt.version values into a Path without canonicalization or containment validation. Relative traversal such as ../victim/foo and an absolute Prompt.name can escape or discard the configured registry root, while overwrite=True permits replacement of existing target files. The poisoned name is persisted in index.json and reconstructed by _load(), allowing the out-of-root path to survive later registry loads. An application that forwards request data into these fields can therefore write Prompt.raw bytes to attacker-chosen paths writable by the application process. This issue is fixed in version 2.4.5.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-71492 since 08/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.4.5 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Banking Software

Vendor

• masci

Name

• banks

Version

• 2.4.0
• 2.4.1
• 2.4.2
• 2.4.3
• 2.4.4

Website

• Product: https://github.com/masci/banks/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion