CVE-2026-45369 json
python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol
published 5mo ago modified 14d ago also GHSA-33p6-5jxp-p3x4 , PYSEC-2026-560 , EUVD-2026-30475
- cvss
- 8.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
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.
Patch / fix
- pypi utcp-cli 1.1.2
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Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 5mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-33p6-5jxp-p3x4 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H |
| OSV | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | utcp-cli | <1.1.2 |
1.1.2 |
Affected products
- universal-tool-calling-protocol python-utcp
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
github.com
/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-33p6-5jxp-p3x4
exploit, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-45369
advisory
-
github.com
/universal-tool-calling-protocol/python-utcp
package
-
pypi.org
/project/utcp-cli
package
-
github.com
/advisories/GHSA-33p6-5jxp-p3x4
advisory
Sources
- CVE List CVE-2026-45369
- GitHub Advisory GHSA-33p6-5jxp-p3x4
- NVD CVE-2026-45369
- OSV PYSEC-2026-560
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