CVE-2025-27607

Public Exploit
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.

Category

8.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 1.75% Top 20%
Vendor Advisory github.com
Affected: nhairs python-json-logger
Published at:
Updated at:

References

Link Tags
https://github.com/nhairs/python-json-logger/security/advisories/GHSA-wmxh-pxcx-9w24 exploit vendor advisory
https://github.com/nhairs/python-json-logger/commit/2548e3a2e3cedf6bef3ee7c60c55b7c02d1af11a patch
https://github.com/nhairs/python-json-logger/commit/e7761e56edb980cfab0165e32469d5fd017a5d72 patch

Frequently Asked Questions

What is the severity of CVE-2025-27607?
CVE-2025-27607 has been scored as a high severity vulnerability.
How to fix CVE-2025-27607?
To fix CVE-2025-27607, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-27607 being actively exploited in the wild?
It is possible that CVE-2025-27607 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27607?
CVE-2025-27607 affects nhairs python-json-logger.
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