Know every vulnerabilitybefore it knows you.
DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.
PYSEC-2026-514
No affected components available
Vulnerability
A vulnerability has been identified in Rasa Pro and Rasa Open Source that enables an attacker who has the ability to load a maliciously crafted model remotely into a Rasa instance to achieve Remote Code Execution.
The prerequisites for this are:
- The HTTP API must be enabled on the Rasa instance eg with
--enable-api. This is not the default configuration. - For unauthenticated RCE to be exploitable, the user must not have configured any authentication or other security controls recommended in our documentation.
- For authenticated RCE, the attacker must posses a valid authentication token or JWT to interact with the Rasa API.
Fix
We encourage you to upgrade to a version of Rasa that includes a fix. These are:
- Rasa Pro 3.8.18, 3.9.16, 3.10.12
- Rasa Open Source 3.6.21
Once you have upgraded your Rasa Pro or Open Source installation, you will need to retrain your model using the fixed version of Rasa Pro or Open Source. If you have a custom component that inherits from one of the components listed below and modified the persist or load method, make sure to update your code. Please contact us in case you encounter any problems.
Affected components:
CountVectorFeaturizerLexicalSyntacticFeaturizerLogisticRegressionClassifierSklearnIntentClassifierDIETClassifierCRFEntityExtractorTrackerFeaturizerTEDPolicyUnexpectedIntentTEDPolicy
If you are unable to upgrade immediately, please follow our mitigation advice below.
Mitigation Advice
-
The unauthenticated RCE can be mitigated by ensuring that you enable authentication for the Rasa HTTP API if this is enabled. This means that in addition to passing
--enable-apito Rasa, you should also pass an authentication configuration as described in our documentation here. -
The authenticated RCE can be mitigated by:
- Ensuring that you only load models from trusted sources such as your own CI pipelines. You can check file hashes for model archives to confirm that a model has not been tampered with between training and use.
- Confirming that you have sufficient access controls and utilize the principle of least privilege to control who in your organization has the ability to interact with the Rasa API even with authentication enabled.
Future Releases
As an additional security step, a future release of Rasa Pro will remove the ability to enable the API without any authentication method enabled.
Credit
Rasa would like to thank Julian Scheid from Deutsche Telekom Security GmbH for responsible disclosure of this vulnerability.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
Browse More
Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.
Checkout DevGuard