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CVE-2025-27607— Python JSON Logger has a Potential RCE via missing `msgspec-python313-pre` dependency

Quick assessment

Affected
nhairs python-json-logger
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Python JSON Logger是Nicholas Hairs个人开发者的一个 Python 日志的 JSON 格式化工具。 Python JSON Logger 3.3.0之前版本存在安全漏洞，该漏洞源于缺失的依赖可能导致远程代码执行。

CVSS 8.8 · High EPSS 1.61% · P76

Possible ATT&CK Techniques 1 AI

T1195.002 · Compromise Software Supply Chain
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I. Basic Information for CVE-2025-27607

Vulnerability Information
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Vulnerability Title
Python JSON Logger has a Potential RCE via missing `msgspec-python313-pre` dependency
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
从非可信控制范围包含功能例程
Source: CVE Program / CVE List V5
Vulnerability Title
Python JSON Logger 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python JSON Logger是Nicholas Hairs个人开发者的一个 Python 日志的 JSON 格式化工具。 Python JSON Logger 3.3.0之前版本存在安全漏洞，该漏洞源于缺失的依赖可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nhairs python-json-logger >= 3.2.0, < 3.3.0 -

II. Public POCs for CVE-2025-27607

# POC Description Source Link Shenlong Link
1 CVE-2025-27607 fix https://github.com/Barsug/msgspec-python313-pre POC Details
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Qwen3.6-35B-A3B · 7250 chars
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III. Intelligence Information for CVE-2025-27607

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Patches & Fixes for CVE-2025-27607 (2)

Vendor Advisories for CVE-2025-27607 (1)

IV. Related Vulnerabilities

Same weakness: CWE-829

V. Comments for CVE-2025-27607

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