CVE-2025-27607

HIGH

Python JSON Logger <4 Mar 2025 - RCE

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2025-27607. PoCs published by Barsug.

AI-analyzed exploit summary The repository contains only a README.md file with minimal content, referencing CVE-2025-27607 but providing no exploit code or technical details. It appears to be a placeholder or stub for a fix.

Description

Python JSON Logger is a JSON Formatter for Python Logging. Between 30 December 2024 and 4 March 2025 Python JSON Logger was vulnerable to RCE through a missing dependency. This occurred because msgspec-python313-pre was deleted by the owner leaving the name open to being claimed by a third party. If the package was claimed, it would allow them RCE on any Python JSON Logger user who installed the development dependencies on Python 3.13 (e.g. pip install python-json-logger[dev]). This issue has been resolved with 3.3.0.

Exploits (1)

nomisec STUB
by Barsug · poc
https://github.com/Barsug/msgspec-python313-pre

The repository contains only a README.md file with minimal content, referencing CVE-2025-27607 but providing no exploit code or technical details. It appears to be a placeholder or stub for a fix.

Classification
Stub 90%
Attack Type
Other
Complexity
Trivial
Reliability
Theoretical
Target: msgspec (version unspecified)
No auth needed
Prerequisites: none
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Scores

CVSS v3 8.8
EPSS 0.0145
EPSS Percentile 69.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-829
Status published
Products (1)
nhairs/python_json_logger < 3.3.0
Published Mar 07, 2025
Tracked Since Feb 18, 2026