Vulnerability · Published May 14, 2026 · Assigned by GitHub_M

CVE-2026-45370python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection

High 7.7

In plain English

A high-severity security flaw in python-utcp from universal-tool-calling-protocol. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.2%top 87.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	utcp-cli	1.1.2	GHSA-5v57-8rxj-3p2r
PyPI	utcp-cli	1.1.2	PYSEC-2026-3395

Affected products (as reported)

Vendor	Product	Versions
universal-tool-calling-protocol	python-utcp	< 1.1.2

Weakness: CWE-526 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-5v57-8rxj-3p2r x_refsource_CONFIRM