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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.7 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS

• CVE-2026-45370: 0.22% estimated exploitation activity in the next 30 days; percentile 13.04 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary prepareenvironment() in clicommunicationprotocol.py passes a full copy of os.environ to every CLI subprocess. When combined with the Command Injection vulnerability (CWE-78) in substituteutcpargs() tracked as GHSA-33p6-5jxp-p3x4, an attacker can exfiltrate all process-level secrets in a single tool call. Vulnerable Code Impact Any environment variable present in the host process is accessible to injected commands. In typical AI agent deployments this includes: - Cloud provider credentials (AWSSECRETACCESSKEY, AZURECLIENTSECRET) - Database connection strings (DATABASEURL) - LLM API keys (OPENAIAPIKEY, ANTHROPICAPIKEY) - Internal service tokens Proof of Concept Patched Fixed in utcp-cli 1.1.2. prepareenvironment no longer copies the full host environment. Inheritance is controlled by a new CliCallTemplate.inheritenvvars field: - null (default): a small built-in OS-specific allowlist (PATH, HOME, LANG on Unix; PATH, PATHEXT, SYSTEMROOT, USERPROFILE, etc. on Windows) is inherited…

Published by the source

14 May 2026, 20:56 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-5v57-8rxj-3p2r

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-5v57-8rxj-3p2r

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# Patch Next advisory brief: CVE-2026-45370

Advisory: python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection
IDs: CVE-2026-45370, GHSA-5v57-8rxj-3p2r
Record: https://patchnext.com/advisories/cve-2026-45370 (revision 2, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: utcp-cli 1.1.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI utcp-cli: affected <= 1.1.1; fixed in 1.1.2

## Suggested inspection (read-only)
- `python -m pip show utcp-cli`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on utcp-cli.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-5v57-8rxj-3p2r (OSV record GHSA-5v57-8rxj-3p2r lists affected ranges: PyPI utcp-cli >=0 <1.1.2 (fixed))
- Verified: https://github.com/advisories/GHSA-5v57-8rxj-3p2r (GitHub-reviewed advisory GHSA-5v57-8rxj-3p2r lists affected ranges: PyPI utcp-cli >=0 <=1.1.1)

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