CVE-2026-45370

FAUCET Score

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.

First published: May 14, 2026Last modified: May 14, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
Universal-Tool-Calling-Protocol	Python-Utcp	< 1.1.2CNA affected

CVSS Data

CVSS version used by this source: 3.1

7.7HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

Exploitability Score

3.1

Impact Score

4.0

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.22%

Probability of exploitation in next 30 days

EPSS Percentile

13.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-26

Model: v2026.06.15

This CVE's current EPSS score of 0.0022 is in the 2nd percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

pippatch availablevia ghsa

Product: utcp-cliFixed in: 1.1.2

Vendor Advisories (1)

pipGHSA-5v57-8rxj-3p2rhigh

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

May 14, 2026

References

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