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AI / ML CVE-2026-0773

CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-01-23 zdi-disclosures@trendmicro.com
RCE Deserialization AI / ML
9.8
CVSS 3.0 · NVD
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Severity by source

NVD PRIMARY
9.8 CRITICAL
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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 23, 2026 - 04:16 nvd
CRITICAL 9.8

DescriptionCVE.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.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send malicious serialized payload to add_tool endpoint
Exploit
Trigger unsafe deserialization of untrusted data
Impact
Execute arbitrary code as service account
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Vulnerability AssessmentAI

Exploitation Upsonic service with add_tool endpoint accessible on TCP port 7541 (default). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.8, EPSS 1.3%. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a cloudpickle-serialized payload containing a malicious lambda function to Upsonic. Upon deserialization, the lambda executes, providing arbitrary code execution.
Remediation Update Upsonic. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems running Upsonic and isolate from production networks if possible; enable enhanced logging and monitoring for suspicious activity. …

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CVE-2026-0773 vulnerability details – vuln.today
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