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CVE-2026-30625

Remote Code Execution via MCP Task Creation in Upsonic 0.71.6

Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. The application allows users to define MCP tasks with arbitrary command and args values. Although an allowlist exists, certain allowed commands (npm, npx) accept argument flags that enable execution of arbitrary OS commands. Maliciously crafted MCP tasks may lead to remote code execution with the privileges of the Upsonic process. In version 0.72.0 Upsonic added a warning about using Stdio servers being able to execute commands directly on the machine.

CVSS 3.1 · 9.8 Critical EPSS 1.0% KEV · Not listed
Vendors
Upsonic
Products
Upsonic
CVE-2026-0773

Upsonic Cloudpickle Deserialization of Untrusted Data Remote Code Execution Vulnerability

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.

CVSS 3.0 · 9.8 Critical EPSS 1.4% KEV · Not listed
Vendors
Upsonic
Products
Upsonic
CVE-2025-6278

Upsonic server.py os.path.join path traversal

A vulnerability classified as critical was found in Upsonic up to 0.55.6. This vulnerability affects the function os.path.join of the file markdown/server.py. The manipulation of the argument file.filename leads to path traversal. The exploit has been disclosed to the public and may be used.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Upsonic
Products
Upsonic
CVE-2025-6279

Upsonic Pickle add_tool cloudpickle.loads deserialization

A vulnerability, which was classified as critical, has been found in Upsonic up to 0.55.6. This issue affects the function cloudpickle.loads of the file /tools/add_tool of the component Pickle Handler. The manipulation leads to deserialization. The exploit has been disclosed to the public and may be used.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Upsonic
Products
Upsonic