CVE-2025-14542 json
Command execution in python-utcp allows attackers to achieve remote code execution when fetching a remote Manual from a malicious endpoint
published 2025-12-13 10 mo ago modified 2026-10-14 26 d ago also GHSA-75mj-4g74-9rg2 , PYSEC-2026-2000 , EUVD-2025-203260
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
Summary
The vulnerability arises when a client fetches a tools’ JSON specification, known as a Manual, from a remote Manual Endpoint. While a provider may initially serve a benign manual (e.g., one defining an HTTP tool call), earning the clients’ trust, a malicious provider can later change the manual to exploit the client.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 10 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | utcp | <1.1.0 |
1.1.0 |
Classification
- Weakness
-
- CWE-501 Trust Boundary Violation
References
-
github.com
/universal-tool-calling-protocol/python-utcp/commit/2dc9c02df72cad3770c934959325ec344b441444
patch, web
-
research.jfrog.com
/vulnerabilities/python-utcp-untrusted-manual-command-execution-jfsa-2025-001648329/
third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-14542
advisory
-
github.com
/universal-tool-calling-protocol/python-utcp
web
-
research.jfrog.com
/vulnerabilities/python-utcp-untrusted-manual-command-execution-jfsa-2025-001648329
web
-
pypi.org
/project/utcp
package
-
github.com
/advisories/GHSA-75mj-4g74-9rg2
advisory
Sources
- CVE List CVE-2025-14542
- GitHub Advisory GHSA-75mj-4g74-9rg2
- NVD CVE-2025-14542
- OSV PYSEC-2026-2000
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.