CVE-2026-45370 json
python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection
published 2026-05-14 5 mo ago modified 2026-10-26 13 d ago also GHSA-5v57-8rxj-3p2r , PYSEC-2026-3395 , EUVD-2026-30477
- cvss
- 7.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 13%
- public exploits
- 0
- none known
Summary
python-utcp is the python implementation of UTCP. Prior to 1.1.3, _prepare_environment() in cli_communication_protocol.py passes a full copy of os.environ to every CLI subprocess. When combined with CVE-2026-45369, an attacker can exfiltrate all process-level secrets in a single tool call. This vulnerability is fixed in 1.1.3.
Patch / fix
- pypi utcp-cli 1.1.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-5v57-8rxj-3p2r referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
| OSV | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
| GitHub | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
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-526 Cleartext Storage of Sensitive Information in an Environment Variable
References
-
github.com
/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-5v57-8rxj-3p2r
exploit, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-45370
advisory
-
github.com
/universal-tool-calling-protocol/python-utcp
package
-
pypi.org
/project/utcp-cli
package
-
github.com
/advisories/GHSA-5v57-8rxj-3p2r
advisory
Sources
- CVE List CVE-2026-45370
- GitHub Advisory GHSA-5v57-8rxj-3p2r
- NVD CVE-2026-45370
- OSV PYSEC-2026-3395
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