crownpku Rasa_NLU_Chi up to 0.12.2 Model Persistor rasa_nlu/persistor.py Persistor._decompress path traversal

Summaryinfo

A vulnerability was found in crownpku Rasa_NLU_Chi up to 0.12.2. It has been classified as critical. Affected by this vulnerability is the function Persistor._decompress of the file rasa_nlu/persistor.py of the component Model Persistor. This manipulation causes path traversal. This vulnerability is registered as CVE-2026-117509. Remote exploitation of the attack is possible. Furthermore, an exploit is available. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability was found in crownpku Rasa_NLU_Chi up to 0.12.2. It has been declared as critical. Affected by this vulnerability is the function Persistor._decompress of the file rasa_nlu/persistor.py of the component Model Persistor. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-117509. The exploitation appears to be easy. The attack can be launched remotely. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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

Productinfo

Vendor

• crownpku

Name

• Rasa_NLU_Chi

Version

• 0.12.0
• 0.12.1
• 0.12.2

Website

• Product: https://github.com/crownpku/Rasa_NLU_Chi/

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Accepted

• Submit #1024527: crownpku Rasa_NLU_Chi 0.12.2, commit f995c06e5aee5b6f68ea877c1a271667357a1c68 Path Traversal (by Dem000000)

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