CVE-2025-27607: Python JSON Logger has a Potential RCE via missing `msgspec-python313-pre` dependency
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.
Classification
CVE ID: CVE-2025-27607
CVSS Base Severity: HIGH
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected Products
Vendor: nhairs
Product: python-json-logger
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.61% (probability of being exploited)
EPSS Percentile: 67.32% (scored less or equal to compared to others)
EPSS Date: 2025-04-05 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-27607https://github.com/nhairs/python-json-logger/security/advisories/GHSA-wmxh-pxcx-9w24
https://github.com/nhairs/python-json-logger/commit/2548e3a2e3cedf6bef3ee7c60c55b7c02d1af11a
https://github.com/nhairs/python-json-logger/commit/e7761e56edb980cfab0165e32469d5fd017a5d72