kvcache-ai ktransformers up to 0.5.3 Pickle pickle.loads deserialization

Summaryinfo

A vulnerability categorized as very critical has been discovered in kvcache-ai ktransformers up to 0.5.3. The impacted element is the function pickle.loads of the component Pickle Handler. Such manipulation leads to deserialization. This vulnerability is traded as CVE-2026-26210. The attack may be launched remotely. There is no exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in kvcache-ai ktransformers up to 0.5.3. It has been rated as very critical. Affected by this issue is the function pickle.loads of the component Pickle Handler. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

KTransformers through 0.5.3 contains an unsafe deserialization vulnerability in the balance_serve backend mode where the scheduler RPC server binds a ZMQ ROUTER socket to all interfaces with no authentication and deserializes incoming messages using pickle.loads() without validation. Attackers can send a crafted pickle payload to the exposed ZMQ socket to execute arbitrary code on the server with the privileges of the ktransformers process.

The weakness was shared by Valentin Lobstein. The advisory is available at chocapikk.com. This vulnerability is handled as CVE-2026-26210 since 02/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/24/2026).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Artificial Intelligence Software

Vendor

• kvcache-ai

Name

• ktransformers

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3

Website

• Product: https://github.com/kvcache-ai/ktransformers/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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