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TI-2026-33160 Aliases CVE-2026-45369GHSA-33p6-5jxp-p3x4

python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol

Priority HIGH 71CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-78.

Summary

python-utcp is the python implementation of UTCP. Prior to 1.1.3, the _substitute_utcp_args method in cli_communication_protocol.py inserts user-controlled tool_args values directly into shell command strings without any sanitization or escaping. These commands are then executed via /bin/bash -c (Unix) or powershell.exe -Command (Windows), allowing an attacker to inject arbitrary shell commands. This vulnerability is fixed in 1.1.3.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00322 25th percentileScored 2026-11-07
Fix Fixed python-utcp (universal-tool-calling-protocol): 1.1.2utcp-cli (PyPI): 1.1.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
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
universal-tool-calling-protocolpython-utcpbefore 1.1.21.1.2Patch availableCNA
—utcp-cli (PyPI)before 1.1.21.1.2Patch availableGHSA-33p6-5jxp-p3x4
  • python-utcp Vendoruniversal-tool-calling-protocol Affected before 1.1.2 Fixed in 1.1.2 Patch available CNA
  • utcp-cli (PyPI) Vendor— Affected before 1.1.2 Fixed in 1.1.2 Patch available GHSA-33p6-5jxp-p3x4

Remediation

  • Fix · CNA python-utcp (universal-tool-calling-protocol) Fixed in 1.1.2
  • Fix · GHSA-33p6-5jxp-p3x4 utcp-cli (PyPI) Fixed in 1.1.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45369
  2. 2026-10-03 Alias added: GHSA-33p6-5jxp-p3x4

References

Advisory 1

Other 2

  • TI-2026-65093 python-utcp before 1.1.4 SSRF via unvalidated HTTP redirects CVSS 4.0HIGH 8.4
  • TI-2026-65092 utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass CVSS 4.0HIGH 7.1
  • TI-2026-10502 universal-tool-calling-protocol python-utcp utcp-gql/utcp-websocket server-side request forgery CVSS 4.0MEDIUM 5.3
  • TI-2026-65094 utcp-gql and utcp-websocket before 1.1.1 SSRF via URL validation bypass CVSS 4.0LOW 2.3
  • TI-2026-33161 python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection CVSS 3.1HIGH 7.7
  • TI-2026-65091 python-utcp before 1.1.12 SSRF via Remote HTTP Manual CVSS 4.0HIGH 7.1
See all 9 →

Sources

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