PYSEC-2026-2000

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/utcp/PYSEC-2026-2000.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-2000
Aliases
Published
2026-07-07T16:03:12.815097Z
Modified
2026-07-07T17:47:54.161359607Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Universal Tool Calling Protocol (UTCP) client library for Python vulnerable to Trust Boundary Violation through Manual JSON specification
Details

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.

References

Affected packages

PyPI / utcp

Package

Name
utcp
View open source insights on deps.dev
Purl
pkg:pypi/utcp

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.1.0

Affected versions

0.*
0.1.0
0.1.2
0.1.3
0.1.4
0.1.5
0.1.6
0.1.7
0.1.8
0.2.0
0.2.1
0.2.2
0.2.3
1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/utcp/PYSEC-2026-2000.yaml"