# CVE-2025-27607

## Summary

- **CVE ID:** CVE-2025-27607
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-829
- **Published:** Mar 7, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- nhairs — python-json-logger (>= 3.2.0, < 3.3.0)

## References

- [CNA](https://github.com/nhairs/python-json-logger/security/advisories/GHSA-wmxh-pxcx-9w24)
- [CNA](https://github.com/nhairs/python-json-logger/commit/2548e3a2e3cedf6bef3ee7c60c55b7c02d1af11a)
- [CNA](https://github.com/nhairs/python-json-logger/commit/e7761e56edb980cfab0165e32469d5fd017a5d72)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.99%
- **EPSS Percentile:** 79.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._