Vulnerability · Published Mar 7, 2025 · Assigned by GitHub_M
CVE-2025-27607Python JSON Logger has a Potential RCE via missing `msgspec-python313-pre` dependency
High 8.8
In plain English
A high-severity security flaw in python-json-logger from nhairs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | python-pythonjsonlogger | no fix listed | UBUNTU-CVE-2025-27607 |
| Ubuntu:24.04:LTS | python-pythonjsonlogger | no fix listed | UBUNTU-CVE-2025-27607 |
| Ubuntu:25.10 | python-pythonjsonlogger | no fix listed | UBUNTU-CVE-2025-27607 |
| Ubuntu:26.04:LTS | python-pythonjsonlogger | no fix listed | UBUNTU-CVE-2025-27607 |
| Ubuntu:26.10 | python-pythonjsonlogger | no fix listed | UBUNTU-CVE-2025-27607 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nhairs | python-json-logger | >= 3.2.0, < 3.3.0 |
Weakness: CWE-829 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/nhairs/python-json-logger/security/advisories/GHSA-wmxh-pxcx-9w24 x_refsource_CONFIRM
- https://github.com/nhairs/python-json-logger/commit/2548e3a2e3cedf6bef3ee7c60c55b7c02d1af11a x_refsource_MISC
- https://github.com/nhairs/python-json-logger/commit/e7761e56edb980cfab0165e32469d5fd017a5d72 x_refsource_MISC