CVE-2026-0773
CRITICALCVSS Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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Description
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.
Analysis
Upsonic has an insecure deserialization via cloudpickle (EPSS 1.3%) enabling remote code execution through crafted serialized AI agent data.
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Remediation
Within 24 hours: Identify all systems running Upsonic and isolate from production networks if possible; enable enhanced logging and monitoring for suspicious activity. Within 7 days: Implement network segmentation to restrict Upsonic traffic; apply WAF rules to block malicious deserialization payloads; disable Cloudpickle deserialization if not business-critical. …
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