AI / ML CVE-2026-0773
CRITICALSeverity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Upsonic Cloudpickle Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Upsonic. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the add_tool endpoint, which listens on TCP port 7541 by default. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-26845.
AnalysisAI
Upsonic has an insecure deserialization via cloudpickle (EPSS 1.3%) enabling remote code execution through crafted serialized AI agent data.
Technical ContextAI
Upsonic uses cloudpickle for serialization (CWE-502), which is inherently unsafe for untrusted data as it can deserialize arbitrary Python objects including those with code execution side effects.
Affected ProductsAI
Upsonic
RemediationAI
Update Upsonic. Replace cloudpickle with JSON or protobuf for inter-process communication.
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Same weakness CWE-502 – Deserialization of Untrusted Data
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External POC / Exploit Code
Leaving vuln.today