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TI-2026-00556 Aliases CVE-2026-0773GHSA-8rrj-mw9c-258v

Deserialization of untrusted data in Upsonic

Priority MEDIUM 52CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01438 73rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UpsonicUpsonic0.52.1—No fix listedCNA
  • Upsonic VendorUpsonic Affected 0.52.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-0773
  2. 2026-10-03 Alias added: GHSA-8rrj-mw9c-258v

References

Other 1

  • TI-2025-05681 Upsonic Pickle add_tool cloudpickle.loads deserialization CVSS 4.0MEDIUM 5.1
  • TI-2025-05680 Upsonic server.py os.path.join path traversal CVSS 4.0MEDIUM 5.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences