Remote Code Execution Vulnerability in Upsonic Cloudpickle
CVE-2026-0773

9.8CRITICAL

Key Information:

Vendor

Upsonic

Status
Upsonic
Vendor
CVE Published:
23 January 2026

What is CVE-2026-0773?

The vulnerability in Upsonic Cloudpickle stems from improper validation of user-supplied data within the add_tool endpoint. This flaw, which operates on TCP port 7541 by default, enables remote attackers to exploit deserialization of untrusted data. As a result, malicious users can execute arbitrary code in the context of the service account, leading to potential unauthorized access and significant security risks.

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Affected Version(s)

Upsonic 0.52.1

References

https://www.zerodayinitiative.com/advisories/ZDI-26-042/
x_research-advisory

CVSS V3.0

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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